@inbook{Pauli1921a,
     author        = {Pauli, E.},
     title         = {Relativit\"atstheorie},
     booktitle     = {Enzyklop\"adie der Mathematischen Wissenschaften},
     publisher     = {Teubner},
     address       = {Leipzig und Berlin},
     year          = {1921},
     keywords      = {Special Relativity, General Relativity, Weyl's Theory},
     volume        = {219},
     ReferencedIn  = {lrr-2004-2}
}

@book{Ludwig1951,
     author        = {Ludwig, G.},
     title         = {Fortschritte der projektiven Relativit\"atstheorie},
     publisher     = {Vieweg},
     address       = {Braunschweig},
     year          = {1951},
     keywords      = {Projective relativity},
     ReferencedIn  = {lrr-2004-2}
}

@book{Whittaker1953,
     author        = {Whittaker, J.M.},
     title         = {A History of the Theories of Aether and Electricity 1900-1926},
     publisher     = {Nelson \& Sons},
     address       = {London},
     year          = {1953},
     keywords      = {history of physics, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@book{Lichnerowicz1955,
     author        = {Lichnerowicz, A.},
     title         = {Th\'eories de la Gravitation et de L'\'Electromagn\'etisme},
     publisher     = {Masson},
     address       = {Paris},
     year          = {1955},
     keywords      = {unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@book{Tonnelat1955,
     author        = {Tonnelat, M.A.},
     title         = {La th\'eorie du champ unifi\'e d'Einstein et quelques-uns de ses d\'eveloppements},
     publisher     = {Gauthier-Villars},
     address       = {Paris},
     year          = {1955},
     keywords      = {unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@book{Jordan1955,
     author        = {Jordan, P.},
     title         = {Schwerkraft und Weltall},
     publisher     = {Vieweg},
     address       = {Braunschweig},
     year          = {1955},
     keywords      = {projective relativity, scalar-tensor theories of gravitation},
     edition       = {2nd},
     ReferencedIn  = {lrr-2004-2}
}

@book{Schmutzer1968,
     author        = {Schmutzer, E.},
     title         = {Relativistische Physik (Klassische Theorie)},
     publisher     = {Akademische Verlagsgesellschaft},
     address       = {Leipzig},
     year          = {1968},
     keywords      = {differential geometry, general relativity, projective relativity},
     ReferencedIn  = {lrr-2004-2}
}

@book{KirstenTreder1979,
     author        = {Kirsten, C. and Treder, H.-J.},
     title         = {Albert Einstein in Berlin 1913-1933. Teil I: Darstellungen und Dokumente},
     publisher     = {Akademie-Verlag},
     address       = {Berlin},
     year          = {1979},
     keywords      = {Einstein, history of science},
     ReferencedIn  = {lrr-2004-2}
}

@inbook{Bergmann1979,
     author        = {Bergmann, P.G.},
     editor        = {Treder, H.-J.},
     title         = {Unitary Field Theory: Yesterday, Today, Tomorrow},
     booktitle     = {Einstein-Centenarium 1979},
     publisher     = {Akademie-Verlag},
     address       = {Berlin},
     year          = {1979},
     keywords      = {Einstein, history of science},
     ReferencedIn  = {lrr-2004-2}
}

@article{Straumann1987,
     author        = {Straumann, N.},
     title         = {Zum Ursprung der Eichtheorien bei Hermann Weyl},
     journal       = {Phys. Blaetter},
     volume        = {43},
     pages         = {414--421},
     year          = {1987},
     keywords      = {Weyl's theory, gauge theory},
     ReferencedIn  = {lrr-2004-2}
}

@inbook{Straumann2001,
     author        = {Straumann, N.},
     editor        = {Scholz, E.},
     title         = {Urspr\"unge der Eichtheorien},
     booktitle     = {Hermann Weyl's Raum-Zeit-Materie and a General Introduction to His Scientific Work},
     publisher     = {Birkh\"auser},
     address       = {Basel/Boston/Berlin},
     year          = {2001},
     keywords      = {Weyl's theory, gauge theory, history of science},
     ReferencedIn  = {lrr-2004-2}
}

@article{ORaifeartaighStraumann2000,
     author        = {O'Raifeartaigh, L. and Straumann, N.},
     title         = {Gauge theory: Historical origins and some modern developments},
     journal       = {Rev. Mod. Phys.},
     volume        = {72},
     pages         = {1--23},
     year          = {2000},
     keywords      = {gauge theory},
     ReferencedIn  = {lrr-2004-2}
}

@inbook{Vizgin1989,
     author        = {Vizgin, V.P.},
     editor        = {Howard, D. and Stachel, J.},
     title         = {The geometrical Unified Field Program},
     booktitle     = {Einstein and the History of General Relativity},
     publisher     = {Birkh\"auser},
     address       = {Boston},
     pages         = {300--314},
     year          = {1989},
     keywords      = {history of science, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@inbook{Bergia1993,
     author        = {Bergia, S.},
     editor        = {Earman, J. and Janssen, M. and Norton, J. D.},
     title         = {Attempts at unified field theories (1919-1955). Alleged failure and intrinsic validation/refutation criteria},
     booktitle     = {The Attraction of Gravitation. New Studies in the History of General Relativity},
     publisher     = {Birkh\"auser},
     address       = {Boston},
     pages         = {274--307},
     year          = {1993},
     keywords      = {history of science, unified field theory},
     series        = {Einstein Studies},
     volume        = {5},
     ReferencedIn  = {lrr-2004-2}
}

@book{Vizgin1994,
     author        = {Vizgin, V.P.},
     title         = {Unified field theories in the first third of the 20th century},
     publisher     = {Birkhaeuser},
     address       = {Basel},
     year          = {1994},
     keywords      = {history of science, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@techreport{GoldsteinRitter2000,
     title         = {The Varieties of Unity: Sounding Unified Theories 1920-1930},
     institution   = {Max-Planck-Institut for History of Science},
     address       = {Berlin, Germany},
     year          = {2000},
     keywords      = {history of science, unified field theory},
     number        = {149},
     author        = {Goldstein, C. and Ritter, J.},
     ReferencedIn  = {lrr-2004-2}
}

@proceedings{Scholz2001a,
     title         = {Hermann Weyl's Raum-Zeit-Materie and a general introduction to his scientific work: Proceedings DMV workshop on Hermann Weyl, Oberwolfach 1993},
     editor        = {Scholz, E.},
     publisher     = {Birkh\"auser},
     address       = {Boston and Basel},
     year          = {2000},
     keywords      = {history of science, Weyl's theory, differential geometry},
     ReferencedIn  = {lrr-2004-2}
}

@book{Stachel2002,
     author        = {Stachel, J.},
     title         = {Einstein from `B' to `Z'},
     publisher     = {Birkh\"auser},
     address       = {Boston/Basel/Berlin},
     year          = {2002},
     keywords      = {history of science, Einstein},
     ReferencedIn  = {lrr-2004-2}
}

@book{French1979,
     editor        = {French, A.P.},
     title         = {Einstein: A Centenary Volume},
     publisher     = {Heinemann},
     address       = {London},
     year          = {1979},
     keywords      = {history of science, Einstein},
     ReferencedIn  = {lrr-2004-2}
}

@book{Jordan1969,
     author        = {Jordan, P.},
     title         = {Albert Einstein. Sein Lebenswerk und die Zukunft der Physik},
     publisher     = {Huber},
     address       = {Frauenfeld},
     year          = {1969},
     keywords      = {Einstein},
     ReferencedIn  = {lrr-2004-2}
}

@book{Foelsing1993,
     author        = {F\"olsing, A.},
     title         = {Albert Einstein. Eine Biographie},
     publisher     = {Suhrkamp},
     address       = {Frankfurt am Main},
     year          = {1993},
     keywords      = {Einstein},
     ReferencedIn  = {lrr-2004-2}
}

@book{Hermann1994,
     author        = {Hermann, A.},
     title         = {Einstein. Der Weltweise und sein Jahrhundert. Eine Biographie},
     publisher     = {Piper},
     address       = {M\"unchen},
     year          = {1994},
     keywords      = {Einstein},
     ReferencedIn  = {lrr-2004-2}
}

@book{Biezunski1993,
     author        = {Biezunski, M.},
     title         = {Histoire de la physique moderne},
     publisher     = {La D\'ecouverte},
     address       = {Paris},
     year          = {1993},
     keywords      = {history of physics},
     ReferencedIn  = {lrr-2004-2}
}

@article{Milne1937,
     author        = {Milne, E. et al.},
     title         = {Physical Science and Philosophy},
     journal       = {Nature Suppl.},
     volume        = {139},
     pages         = {997--1008},
     year          = {1937},
     keywords      = {scientific methodology, cosmology},
     ReferencedIn  = {lrr-2004-2}
}

@article{Dirac1927,
     author        = {Dirac, P.A.M.},
     title         = {The quantum theory of emission and absorption of radiation},
     journal       = {Proc. R. Soc. London, Ser. A},
     volume        = {114},
     pages         = {243--265},
     year          = {1927},
     keywords      = {quantum field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Jordan1927a,
     author        = {Jordan, P.},
     title         = {\"Uber Wellen und Korpuskeln in der Quantenmechanik},
     journal       = {Z. Phys.},
     volume        = {45},
     pages         = {766--775},
     year          = {1927},
     keywords      = {quantum field theory, Bose statistics},
     ReferencedIn  = {lrr-2004-2}
}

@article{JordanKlein1927,
     author        = {Jordan, P. and Klein, O.},
     title         = {Zum Mehrk\"orperproblem der Quantentheorie},
     journal       = {Z. Phys.},
     volume        = {45},
     pages         = {751--765},
     year          = {1927},
     keywords      = {quantum field theory, Bose statistics},
     ReferencedIn  = {lrr-2004-2}
}

@article{Jordan1927b,
     author        = {Jordan, P.},
     title         = {Zur Quantenmechanik der Gasentartung},
     journal       = {Z. Phys.},
     volume        = {44},
     pages         = {473--480},
     year          = {1927},
     keywords      = {quantum field theory, Fermi statistics},
     ReferencedIn  = {lrr-2004-2}
}

@article{JordanWig1928,
     author        = {Jordan, P. and Wigner, E.},
     title         = {\"Uber das Paulische `Aquivalenzverbot'},
     journal       = {Z. Phys.},
     volume        = {47},
     pages         = {631--651},
     year          = {1928},
     keywords      = {quantum field theory, Fermi statistics},
     ReferencedIn  = {lrr-2004-2}
}

@book{Schweber1994,
     author        = {Schweber, S.S.},
     title         = {QED and the men who made it: Dyson, Feynman, Schwinger, and Tomonaga},
     publisher     = {Princeton University Press},
     address       = {Princeton},
     year          = {1994},
     ReferencedIn  = {lrr-2004-2}
}

@book{Cao1997,
     author        = {Cao, T.Y.},
     title         = {Conceptual developments of 20th century field theories},
     publisher     = {Cambridge University Press},
     address       = {Cambridge},
     year          = {1997},
     ReferencedIn  = {lrr-2004-2}
}

@inbook{Kojev2002,
     author        = {Kojevnikov, A.},
     editor        = {Balashow, Y. and Vizgin, V.},
     title         = {Dirac's quantum electrodynamics},
     booktitle     = {Einstein Studies in Russia},
     publisher     = {Birkh\"auser},
     address       = {Boston/Basel/Z\"urich},
     pages         = {229--259},
     year          = {2002},
     keywords      = {history of relativity and cosmology},
     ReferencedIn  = {lrr-2004-2}
}

@article{Reichenbaecher1923,
     author        = {Reichenb\"acher, E.},
     title         = {Eine neue Erkl\"arung des Elektromagnetismus},
     journal       = {Z. Phys.},
     volume        = {13},
     pages         = {221--240},
     year          = {1923},
     keywords      = {mixed geometry, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@book{Eddington1924,
     author        = {Eddington, A.S.},
     title         = {The mathematical theory of relativity},
     publisher     = {Cambridge University Press},
     address       = {Cambridge},
     year          = {1924},
     keywords      = {general relativity, mixed geometry, unified field theory},
     edition       = {2nd},
     note          = {1st. edition 1923},
     ReferencedIn  = {lrr-2004-2}
}

@article{Schroedinger1948,
     author        = {Schr\"odinger, E.},
     title         = {The final affine law II},
     journal       = {Proc. R. Irish Acad. A},
     volume        = {51},
     pages         = {205--216},
     year          = {1948},
     keywords      = {unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@book{Wheeler1962,
     author        = {Wheeler, J. A.},
     title         = {Geometrodynamics},
     publisher     = {Academic Press},
     address       = {New York},
     year          = {1962},
     keywords      = {Geometrodynamics},
     series        = {Topics of Modern Physics},
     volume        = {1},
     ReferencedIn  = {lrr-2004-2}
}

@article{NeugebKram1981,
     author        = {Neugebauer, G. and Kramer, D.},
     title         = {Soliton concept in general relativity},
     journal       = {Gen. Relativ. Gravit.},
     volume        = {13},
     pages         = {195--200},
     year          = {1981},
     keywords      = {Gravitational solitons},
     ReferencedIn  = {lrr-2004-2}
}

@article{BoCeKla1991,
     author        = {Boyd, P.T. and Centrella, J.M. and Klasky, S.A.},
     title         = {Properties of gravitational `solitons'},
     journal       = {Phys. Rev. D},
     volume        = {43},
     pages         = {379--90},
     year          = {1991},
     keywords      = {Gravitational solitons},
     ReferencedIn  = {lrr-2004-2}
}

@article{EinsteinBrose1930,
     author        = {Einstein, A.},
     title         = {Professor Einstein's adress at the University of Nottingham},
     journal       = {Science},
     volume        = {71},
     pages         = {608--611},
     year          = {1930},
     keywords      = {special relativity, general relativity, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{SchoutHaant1934,
     author        = {Schouten, J.A. and Haantjes, J.},
     title         = {Generelle Feldtheorie VIII. Autogeod\"atische Linien und Weltlinien},
     journal       = {Z. Phys.},
     volume        = {89},
     pages         = {357--369},
     year          = {1934},
     keywords      = {unified field theory, equations of motion},
     ReferencedIn  = {lrr-2004-2}
}

@book{Cartan1950,
     author        = {Cartan, H.},
     title         = {Oeuvres Compl\`etes},
     publisher     = {Gauthier-Villars},
     address       = {Paris},
     year          = {1950},
     keywords      = {History of science},
     note          = {3 parts with 2 vols. each - 1955},
     ReferencedIn  = {lrr-2004-2}
}

@book{PenroseRind1984,
     author        = {Penrose, R. and Rindler, W.},
     title         = {Spinors and Space-Time},
     publisher     = {Cambridge University Press},
     address       = {Cambridge},
     year          = {1984--1986},
     keywords      = {Spinors, Twistors, relativistic fields},
     note          = {Vol. 1: Two-Spinor Calculus and Relativistic Fields; Vol. 2: Spinor and Twistor Methods in Space-Time Geometry. (1984-1986)},
     ReferencedIn  = {lrr-2004-2}
}

@book{Yano1955,
     author        = {Yano, K.},
     title         = {The theory of Lie derivatives and its applications},
     publisher     = {North-Holland/Noordhoff},
     address       = {Amsterdam/Groningen},
     year          = {1955},
     keywords      = {Group theory, symmetry},
     ReferencedIn  = {lrr-2004-2}
}

@book{Weyl1950,
     author        = {Weyl, H.},
     title         = {The Theory of Groups and Quantum Mechanics},
     publisher     = {Dover},
     address       = {New York},
     year          = {1950},
     keywords      = {Group theory, quantum mechanics},
     note          = {Translation of the 2nd German edition of 1931.},
     ReferencedIn  = {lrr-2004-2}
}

@article{Dirac1930,
     author        = {Dirac, P.A.M.},
     title         = {A Theory of Electrons and Protons},
     journal       = {Proc. R. Soc. London, Ser. A},
     volume        = {126},
     pages         = {360--365},
     year          = {1930},
     keywords      = {Dirac equation, antiparticles},
     ReferencedIn  = {lrr-2004-2}
}

@article{Dirac1931,
     author        = {Dirac, P.A.M.},
     title         = {Quantised Singularities in the Electromagnetic Field},
     journal       = {Proc. R. Soc. London, Ser. A},
     volume        = {133},
     pages         = {60--72},
     year          = {1931},
     keywords      = {Dirac equation, antiparticles},
     ReferencedIn  = {lrr-2004-2}
}

@article{Thomas1930a,
     author        = {Thomas, T.Y.},
     title         = {On the unified field theory},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {16},
     pages         = {761--776},
     year          = {1930},
     keywords      = {distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Thomas1930b,
     author        = {Thomas, T.Y.},
     title         = {On the unified field theory. II},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {16},
     pages         = {830--835},
     year          = {1930},
     keywords      = {distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Thomas1931a,
     author        = {Thomas, T.Y.},
     title         = {On the unified field theory. III},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {17},
     pages         = {48--58},
     year          = {1931},
     keywords      = {distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Thomas1931b,
     author        = {Thomas, T.Y.},
     title         = {On the unified field theory. IV},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {17},
     pages         = {111--119},
     year          = {1931},
     keywords      = {distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Thomas1931c,
     author        = {Thomas, T.Y.},
     title         = {On the unified field theory. V},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {17},
     pages         = {199--210},
     year          = {1931},
     keywords      = {distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Thomas1931d,
     author        = {Thomas, T.Y.},
     title         = {On the unified field theory.VI},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {17},
     pages         = {325--329},
     year          = {1931},
     keywords      = {distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Rosenfeld1930,
     author        = {Rosenfeld, L.},
     title         = {Zur Quantelung der Wellenfelder},
     journal       = {Ann. Phys.},
     volume        = {5},
     pages         = {113--152},
     year          = {1930},
     keywords      = {quantum gravity},
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}

@inbook{Einstein1931a,
     author        = {Einstein, A.},
     title         = {Maxwell's influence on the development of the conception of physical reality},
     booktitle     = {James Clark Maxwell: A Commemoration Volume},
     publisher     = {Cambridge University Press},
     address       = {Cambridge},
     year          = {1931},
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}

@book{Riemann1854,
     author        = {Riemann, B.},
     title         = {\"Uber die Hypothesen, die der Geometrie zu Grunde liegen},
     publisher     = {Wissenschaftliche Buchgesellschaft},
     address       = {Darmstadt},
     year          = {1959},
     keywords      = {Differential geometry},
     note          = {Reprint},
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}

@book{Finsler1918,
     author        = {Finsler, P.},
     title         = {\"Uber Kurven und Fl\"achen in allgemeinen R\"aumen},
     publisher     = {Birkh\"auser},
     address       = {Basel},
     year          = {1951},
     keywords      = {Finsler Geometry},
     series        = {Lehrb\"ucher und Monographien aus dem Gebiete der exakten Wissenschaften: Mathematische Reihe},
     note          = {Unver\"anderter Nachdruck der Dissertation von 1918},
     volume        = {11},
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}

@book{Matsumoto1986,
     author        = {Matsumoto, M.},
     title         = {Foundations of Finsler Geometry and Special Finsler Spaces},
     publisher     = {Kaiseisha Press},
     address       = {Shikagen},
     year          = {1986},
     keywords      = {Finsler Geometry},
     note          = {Otsushi,},
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}

@inbook{EPS1972,
     author        = {Ehlers, J. and Pirani, F.A.E. and Schild, A.},
     editor        = {O'Raiffeartaigh, L.},
     title         = {The Geometry of Free Fall and Light Propagation},
     booktitle     = {Studies in Relativity: Papers in honour of J. L. Synge},
     publisher     = {Clarendon Press},
     address       = {Oxford},
     pages         = {63--84},
     year          = {1972},
     keywords      = {General relativity},
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}

@inbook{Ehlers1973,
     author        = {Ehlers, J.},
     editor        = {Mehra, J.},
     title         = {The nature and structure of space-time},
     booktitle     = {The physicists conception of nature},
     publisher     = {North-Holland},
     address       = {Dordrecht},
     year          = {1973},
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}

@inbook{Ehlers1981,
     author        = {Ehlers, J.},
     editor        = {Nitsch, J. and Pfarr, J. and Stachow, E.-W.},
     title         = {\"Uber den Newtonschen Grenzwert der Einsteinschen Gravitationstheorie},
     booktitle     = {Grundlagenprobleme der modernen Physik},
     publisher     = {Bibliographisches Institut},
     address       = {Mannheim},
     year          = {1981},
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}

@book{Schouten1924a,
     author        = {Schouten, J.A.},
     title         = {Der Ricci-Kalk\"ul},
     publisher     = {Springer},
     address       = {Berlin},
     year          = {1924},
     keywords      = {differential geometry},
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}

@book{Veblen1933a,
     author        = {Veblen, O.},
     title         = {Projektive Relativit\"atstheorie},
     publisher     = {Springer},
     address       = {Berlin},
     year          = {1933},
     keywords      = {Projective geometry, unified field theory},
     series        = {Ergebnisse der Mathematik und ihrer Grenzgebiete},
     volume        = {2},
     ReferencedIn  = {lrr-2004-2}
}

@book{Schouten1954,
     author        = {Schouten, J.A.},
     title         = {Ricci-Calculus},
     publisher     = {Springer},
     address       = {Berlin},
     year          = {1954},
     keywords      = {differential geometry},
     edition       = {2nd},
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}

@book{Wald1984,
     author        = {Wald, R.M.},
     title         = {General Relativity},
     publisher     = {University of Chicago Press},
     address       = {Chicago},
     year          = {1984},
     keywords      = {General Relativity},
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}

@book{Eisenhart1927,
     author        = {Eisenhart, L.P.},
     title         = {Non-Riemannian Geometry},
     publisher     = {American Mathematical Society},
     address       = {Providence},
     year          = {1927},
     keywords      = {differential geometry},
     series        = {American Mathematical Society Colloquium Publications},
     volume        = {VIII},
     ReferencedIn  = {lrr-2004-2}
}

@book{MiThoWhe1973,
     author        = {Misner, C.W. and Thorne, K. and Wheeler, J.A.},
     title         = {Gravitation},
     publisher     = {Freeman},
     address       = {San Francisco},
     year          = {1973},
     keywords      = {General Relativity, Cosmology},
     ReferencedIn  = {lrr-2004-2}
}

@book{Weyl1923,
     author        = {Weyl, H.},
     title         = {Mathematische Analyse des Raumproblems},
     publisher     = {Springer},
     address       = {Berlin},
     year          = {1923},
     keywords      = {projective structure, differential geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Weyl1921a,
     author        = {Weyl, H.},
     title         = {Zur Infinitesimalgeometrie: Einordnung der projektiven und konformen Auffassung},
     journal       = {Nachr. Koenigl. Gesellsch. Wiss. Goettingen, Math.-Phys. Kl.},
     pages         = {99--112},
     year          = {1921},
     keywords      = {connection, differential geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{JThomas1925,
     author        = {Thomas, T.Y.},
     title         = {On the projective and equi-projective geometry of paths},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {11},
     pages         = {199--203},
     year          = {1925},
     keywords      = {projective connection, differential geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Weyl1918a,
     author        = {Weyl, H.},
     title         = {Reine Infinitesimalgeometrie},
     journal       = {Math. Z.},
     volume        = {2},
     pages         = {384--411},
     year          = {1918},
     keywords      = {connection, differential geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Weyl1918b,
     author        = {Weyl, H.},
     title         = {Gravitation und Elektrizit\"at},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {465--478},
     year          = {1918},
     keywords      = {conformal geometry, differential geometry, unified field theory},
     number        = {26},
     note          = {With a ``Nachtrag'' of Einstein, p. 478, and ``Erwiderung des Verfassers'', pp. 478--480},
     ReferencedIn  = {lrr-2004-2}
}

@article{Dirac1928a,
     author        = {Dirac, P.A.M.},
     title         = {The quantum theory of the electron},
     journal       = {Proc. R. Soc. London, Ser. A},
     volume        = {117},
     pages         = {610--624},
     year          = {1928},
     keywords      = {electron spin},
     ReferencedIn  = {lrr-2004-2}
}

@article{Dirac1928b,
     author        = {Dirac, P.A.M.},
     title         = {The quantum theory of the electron},
     journal       = {Proc. R. Soc. London, Ser. A},
     volume        = {118},
     pages         = {351--361},
     year          = {1928},
     keywords      = {electron spin},
     ReferencedIn  = {lrr-2004-2}
}

@inproceedings{Goenner1984,
     author        = {Goenner, H.},
     title         = {Unified field theories from Eddington and Einstein up to now},
     booktitle     = {Proceedings of the A. Eddington Centennial Symposium, Vol. 1: Relativistic Astrophysics and Cosmology},
     year          = {1984},
     editor        = {de Sabbata, V. and Karade, T. M.},
     publisher     = {World Scientific},
     address       = {Singapore},
     keywords      = {unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Nordstroem1914,
     author        = {Nordstr\"om, G.},
     title         = {\"Uber die M\"oglichkeit, das elektromagnetische Feld und das Gravitationsfeld zu vereinigen},
     journal       = {Phys. Z.},
     volume        = {15},
     pages         = {504--506},
     year          = {1914},
     keywords      = {unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Kaluza1921,
     author        = {Kaluza, T.},
     title         = {Zum Unit\"atsproblem in der Physik},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {966--972},
     year          = {1921},
     keywords      = {unified field theory, Kaluza-Klein theory},
     note          = {Zum Unit\"atsproblem in der Physik},
     ReferencedIn  = {lrr-2004-2}
}

@article{Hessenberg1917,
     author        = {Hessenberg, G.},
     title         = {Vektorielle Begr\"undung der Differentialgeometrie},
     journal       = {Math. Ann.},
     volume        = {78},
     pages         = {187--217},
     year          = {1917},
     keywords      = {connection, differential geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{LeviCivita1917,
     author        = {Levi-Civita, T.},
     title         = {Nozione di parallelismo in una variet\`a qualunque e conseguente specificazione geometrica della curvatura Riemanniana},
     journal       = {Rend. Circ. Mat. Palermo},
     volume        = {42},
     pages         = {173--205},
     year          = {1917},
     keywords      = {connection, differential geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Hehl1976,
     author        = {Hehl, F.W. and von der Heyde, P. and Kerlick, G.D. and Nester, J. M.},
     title         = {General relativity with spin and torsion: Foundations and Prospects},
     journal       = {Rev. Mod. Phys.},
     volume        = {48},
     pages         = {393--416},
     year          = {1976},
     keywords      = {spin, torsion},
     ReferencedIn  = {lrr-2004-2}
}

@book{RZM1921,
     author        = {Weyl, H.},
     title         = {Raum, Zeit, Materie},
     publisher     = {Springer},
     address       = {Berlin},
     year          = {1921},
     keywords      = {differential geometry, general relativity, Weyl's theory, unified field theory},
     edition       = {4th, rev.},
     ReferencedIn  = {lrr-2004-2}
}

@article{Schouten1918,
     author        = {Schouten, J.A.},
     title         = {Die direkte Analysis zur neueren Relativit\"atstheorie},
     journal       = {Verh. K. Akad. Wetensch.},
     volume        = {12},
     month         = {February},
     year          = {1918},
     keywords      = {connection, differential geometry},
     number        = {6},
     note          = {Printed as Separatum by Johannes M\"uller, Amsterdam},
     ReferencedIn  = {lrr-2004-2}
}

@book{Struik1922,
     author        = {Struik, D.J.},
     title         = {Grundz\"uge der mehrdimensionalen Geometrie in direkter Darstellung},
     publisher     = {Springer},
     address       = {Berlin},
     year          = {1922},
     keywords      = {connection, differential geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Koenig1919,
     author        = {K\"onig, R.},
     title         = {\"Uber affine Geometrie XXIV. Ein Beitrag zu ihrer Grundlegung},
     journal       = {Ber. Saechs. Gesellsch. Wiss.},
     volume        = {71},
     pages         = {1--19},
     year          = {1919},
     keywords      = {connection, differential geometry},
     ReferencedIn  = {lrr-2004-2}
}

@book{ECP1997,
     editor        = {Schulman, R. and Kox, A.J. and Janssen, M. and Illy, J.},
     title         = {Einstein Collected Papers. Vol. 8A-8B ``The Berlin Years: Correspondence, 1914--1918''},
     publisher     = {Princeton University Press},
     address       = {Princeton},
     year          = {1997},
     keywords      = {History of Physics},
     ReferencedIn  = {lrr-2004-2}
}

@article{Mie1912a,
     author        = {Mie, G.},
     title         = {Grundlagen einer Theorie der Materie},
     journal       = {Ann. Phys.},
     volume        = {37},
     pages         = {511--534},
     year          = {1912},
     ReferencedIn  = {lrr-2004-2}
}

@article{Mie1912b,
     author        = {Mie, G.},
     title         = {Grundlagen einer Theorie der Materie. II},
     journal       = {Ann. Phys.},
     volume        = {39},
     pages         = {1--40},
     year          = {1912},
     ReferencedIn  = {lrr-2004-2}
}

@article{Mie1913,
     author        = {Mie, G.},
     title         = {Grundlagen einer Theorie der Materie. III},
     journal       = {Ann. Phys.},
     volume        = {40},
     pages         = {1--66},
     year          = {1913},
     ReferencedIn  = {lrr-2004-2}
}

@book{Laue1923,
     author        = {von Laue, M.},
     title         = {Die Relativit\"atstheorie. Band 2: Die allgemeine Relativit\"atstheorie. Einstein's Lehre von der Schwerkraft},
     publisher     = {Vieweg},
     address       = {Braunschweig},
     year          = {1923},
     edition       = {2nd},
     ReferencedIn  = {lrr-2004-2}
}

@inbook{Hilbert1915,
     author        = {Einstein, A.},
     editor        = {Schulman, R. and Kox, A.J. and Janssen, M. and Illy, J.},
     booktitle     = {Einstein Collected Papers},
     publisher     = {Princeton University Press},
     address       = {Princeton},
     pages         = {195},
     year          = {1997},
     keywords      = {History of Physics},
     number        = {Doc. 140},
     volume        = {8A},
     ReferencedIn  = {lrr-2004-2}
}

@inbook{Einstein1915,
     author        = {Einstein, A.},
     editor        = {Schulman, R. and Kox, A.J. and Janssen, M. and Illy, J.},
     booktitle     = {Einstein Collected Papers},
     publisher     = {Princeton University Press},
     address       = {Princeton},
     pages         = {199},
     year          = {1997},
     keywords      = {History of Physics},
     number        = {Doc. 144},
     volume        = {8B},
     ReferencedIn  = {lrr-2004-2}
}

@mastersthesis{Koenig2000,
     author        = {K\"onig, M.},
     title         = {Herleitung und Untersuchung der Feld- und Bewegungsgleichungen von an das Gravitationsfeld gekoppelten Tensorfeld-Theorien},
     school        = {Institut f\"ur Theoretische Physik, Universit\"at G\"ottingen},
     year          = {2000},
     keywords      = {general relativity},
     type          = {Masters Thesis},
     ReferencedIn  = {lrr-2004-2}
}

@article{Reichenbaecher1917a,
     author        = {Reichenb\"acher, E.},
     title         = {Grundz\"uge zu einer Theorie der Elektrizit\"at und der Gravitation},
     journal       = {Ann. Phys.},
     volume        = {52},
     pages         = {134--173},
     year          = {1917},
     ReferencedIn  = {lrr-2004-2}
}

@article{Reichenbaecher1917b,
     author        = {Reichenb\"acher, E.},
     title         = {3. Nachtrag zu der Arbeit Grundz\"uge zu einer Theorie der Elektrizit\"at und der Gravitation},
     journal       = {Ann. Phys.},
     volume        = {52},
     pages         = {174--178},
     year          = {1917},
     ReferencedIn  = {lrr-2004-2}
}

@article{GoennerHavas1980,
     author        = {Goenner, H. and Havas, P.},
     title         = {Spherically-Symmetric Space-Times with vanishing Curvature Scalar},
     journal       = {J. Math. Phys.},
     volume        = {21},
     pages         = {1159--1167},
     year          = {1980},
     keywords      = {exact solutions},
     ReferencedIn  = {lrr-2004-2}
}

@book{RZM1919,
     author        = {Weyl, H.},
     title         = {Raum, Zeit, Materie},
     publisher     = {Springer},
     address       = {Berlin},
     year          = {1919},
     keywords      = {differential geometry, general relativity, Weyl's theory, unified field theory},
     edition       = {3rd, ess. rev.},
     ReferencedIn  = {lrr-2004-2}
}

@article{Reichenbaecher1920,
     author        = {Reichenb\"acher, E.},
     title         = {Inwiefern l\"asst sich die moderne Gravitationstheorie ohne die Relativit\"at begr\"unden?},
     journal       = {Die Naturwissenschaften},
     volume        = {8},
     pages         = {1008--1010},
     year          = {1920},
     keywords      = {general relativity},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1920,
     author        = {Einstein, A.},
     title         = {Antwort auf vorstehende Betrachtung},
     journal       = {Die Naturwissenschaften},
     volume        = {8},
     pages         = {1010--1011},
     year          = {1920},
     keywords      = {general relativity},
     ReferencedIn  = {lrr-2004-2}
}

@inbook{Pyenson1985,
     author        = {Pyenson, L.},
     editor        = {Pyenson, L.},
     title         = {Physical Sense in Relativity: Max Planck Edits the Annalen der Physik, 1906-1918},
     booktitle     = {The Young Einstein. The Advent of Relativity},
     publisher     = {Adam Hilger},
     address       = {Bristol and Boston},
     year          = {1985},
     keywords      = {history of science, Einstein},
     ReferencedIn  = {lrr-2004-2}
}

@article{Reichenbaecher1926,
     author        = {Reichenb\"acher, E.},
     title         = {Der Elektromagnetismus in der Weltgeometrie},
     journal       = {Phys. Z.},
     volume        = {27},
     pages         = {741--745},
     year          = {1926},
     keywords      = {Finsler geometry, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Newman1927,
     author        = {Newman, M.A.H.},
     title         = {A gauge-invariant tensor calculus},
     journal       = {Proc. R. Soc. London, Ser. A},
     volume        = {116},
     pages         = {603--623},
     year          = {1927},
     keywords      = {Finsler geometry, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Pauli1920,
     author        = {Pauli, W.},
     title         = {Remark after Weyl's lecture in Bad Nauheim (86. Naturforscherversammlung, 19.-25. 9. 1920)},
     journal       = {Phys. Z.},
     volume        = {21},
     pages         = {650--651},
     year          = {1920},
     keywords      = {Special Relativity, General Relativity, Weyl's Theory},
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}

@article{Stachel1993,
     author        = {Stachel, J.},
     title         = {The other Einstein: Einstein contra Field Theory},
     journal       = {Sci. Context},
     volume        = {6},
     pages         = {275--290},
     year          = {1993},
     keywords      = {Classical field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Cartan1931a,
     author        = {Cartan, E.},
     title         = {Le parallelisme absolu et la th\'eorie unitaire du champ},
     journal       = {Rev. Metaphys. Morale},
     volume        = {38},
     pages         = {13--28},
     year          = {1931},
     note          = {Oeuvres Compl\`etes, tome III, 2 pp 1167--1185.},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1919,
     author        = {Einstein, A.},
     title         = {Spielen Gravitationsfelder im Aufbau der materiellen Elementarteilchen eine wesentliche Rolle?},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {349--356},
     year          = {1919},
     keywords      = {Geometrisation of matter fields},
     number        = {20},
     ReferencedIn  = {lrr-2004-2}
}

@book{Weyl1968,
     author        = {Weyl, H.},
     title         = {Gesammelte Abhandlungen},
     publisher     = {Springer},
     address       = {Berlin/Heidelberg/New York},
     year          = {1968},
     keywords      = {History of Physics},
     note          = {4 vols., K. Chandrasekharan, ed.},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1921b,
     author        = {Einstein, A.},
     title         = {\"Uber eine naheliegende Erg\"anzung des Fundamentes der allgemeinen Relativit\"atstheorie},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {261--264},
     year          = {1921},
     keywords      = {General Relativity, Weyl's Theory},
     number        = {12, 13, 14},
     ReferencedIn  = {lrr-2004-2}
}

@article{Ehrenfest1932,
     author        = {Ehrenfest, P.},
     title         = {Einige die Quantenmechanik betreffende Erkundigungsfragen},
     journal       = {Z. Phys.},
     volume        = {78},
     pages         = {555--559},
     year          = {1932},
     keywords      = {Quantum mechanics, spinors},
     ReferencedIn  = {lrr-2004-2}
}

@inproceedings{Scholz2001b,
     author        = {Scholz, E.},
     title         = {Weyls Infinitesimalgeometrie, 1917-1925},
     booktitle     = {Proceedings DMV workshop on Hermann Weyl. Oberwolfach 1993},
     year          = {2000},
     editor        = {Scholz, E.},
     pages         = {48--104},
     publisher     = {Birkh\"auser},
     address       = {Boston and Basel},
     keywords      = {differential geometry, Weyl-geometry},
     ReferencedIn  = {lrr-2004-2}
}

@book{RZM1918,
     author        = {Weyl, H.},
     title         = {Raum, Zeit, Materie},
     publisher     = {Springer},
     address       = {Berlin},
     year          = {1918},
     keywords      = {differential geometry, general relativity, Weyl's theory, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Buchdahl1957,
     author        = {Buchdahl, H.A.},
     title         = {Gauge-invariant generalization of field theories with asymmetric fundamental tensor},
     journal       = {Quart. J. Math.},
     volume        = {8},
     pages         = {89--96},
     year          = {1957},
     keywords      = {differential geometry, Weyl's theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Weitz1920,
     author        = {Weitzenb\"ock, R.},
     title         = {\"Uber die Wirkungsfunktion in der Weyl'schen Physik. I., II.},
     journal       = {Sitzungsber. Akad. Wiss. Wien},
     volume        = {129},
     pages         = {638--708},
     year          = {1920},
     keywords      = {theory of invariants, differential geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Bach1921,
     author        = {Bach, R.},
     title         = {Zur Weylschen Relativit\"atstheorie und der Weylschen Erweiterung des Kr\"ummungsbegriffs},
     journal       = {Math. Z.},
     volume        = {9},
     pages         = {110--135},
     year          = {1921},
     keywords      = {Weyl's theory},
     ReferencedIn  = {lrr-2004-2}
}

@inbook{Lorentz1937,
     author        = {Lorentz, H.A.},
     title         = {The determination of the potentials in the general theory of relativity with some remarks about the measurement of lengths and intervals of time and about the theories of Weyl and Eddington},
     booktitle     = {Collected Papers},
     publisher     = {Nijhoff},
     address       = {The Hague},
     pages         = {363--382},
     year          = {1937},
     keywords      = {General relativity, Weyl's theory, affine geometry},
     volume        = {5},
     note          = {Original paper in Proc. Acad. Amsterdam, 29 (1923) 383},
     ReferencedIn  = {lrr-2004-2}
}

@inbook{Gorelik2002,
     author        = {Gorelik, G.},
     editor        = {Balashow, Y. and Vizgin, V.},
     title         = {Hermann Weyl and Large Numbers in Relativistic Cosmology},
     booktitle     = {Einstein Studies in Russia},
     publisher     = {Birkh\"auser},
     address       = {Boston/Basel/Z\"urich},
     pages         = {91--106},
     year          = {2002},
     keywords      = {history of relativity and cosmology},
     ReferencedIn  = {lrr-2004-2}
}

@book{Speziali1972,
     author        = {Speziali, P.},
     title         = {Albert Einstein - Michele Besso. Correspondance 1903-1955},
     publisher     = {Hermann},
     address       = {Paris},
     year          = {1972},
     keywords      = {Einstein},
     ReferencedIn  = {lrr-2004-2}
}

@article{Weyl1920,
     author        = {Weyl, H.},
     title         = {Elektrizit\"at und Gravitation},
     journal       = {Phys. Z.},
     volume        = {21},
     pages         = {649--650},
     year          = {1920},
     keywords      = {Weyl's theory, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Weyl1921b,
     author        = {Weyl, H.},
     title         = {\"Uber die physikalischen Grundlagen der erweiterten Relativit\"atstheorie},
     journal       = {Phys. Z.},
     volume        = {22},
     pages         = {473--480},
     year          = {1921},
     keywords      = {Weyl's theory, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Weyl1921c,
     author        = {Weyl, H.},
     title         = {Feld und Materie},
     journal       = {Ann. Phys.},
     volume        = {65},
     pages         = {541--563},
     year          = {1921},
     keywords      = {Weyl's theory, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Reichenbaecher1921,
     author        = {Reichenb\"acher, E.},
     title         = {Schwere und Tr\"agheit},
     journal       = {Phys. Z.},
     volume        = {22},
     pages         = {234--243},
     year          = {1921},
     keywords      = {general relativity},
     ReferencedIn  = {lrr-2004-2}
}

@book{Sommerfeld1918,
     author        = {Sommerfeld, A.},
     editor        = {Schulman, R. and Kox, A.J. and Janssen, M. and Illy, J.},
     title         = {Einstein Collected Papers},
     publisher     = {Princeton University Press},
     address       = {Princeton},
     year          = {1997},
     keywords      = {History of Physics},
     number        = {Doc. 619, Note 18, 880},
     volume        = {8B},
     ReferencedIn  = {lrr-2004-2}
}

@book{RZM1952,
     author        = {Weyl, H.},
     title         = {Space, Time, Matter},
     publisher     = {Dover},
     address       = {New York},
     year          = {1952},
     keywords      = {differential geometry, general relativity, Weyl's theory, unified field theory},
     edition       = {4th},
     note          = {English translation of of Weyl's Raum, Zeit, Materie.},
     ReferencedIn  = {lrr-2004-2}
}

@book{Schouten1919,
     author        = {Schouten, J.A.},
     title         = {Die direkte Analysis zur neueren Relativit\"atstheorie},
     publisher     = {Johannes M\"uller},
     address       = {Amsterdam},
     year          = {1919},
     keywords      = {Differential geometry, general relativity, Weyl's theory},
     ReferencedIn  = {lrr-2004-2}
}

@book{Eddington1920,
     author        = {Eddington, A.S.},
     title         = {Space, Time, and Gravitation: An outline of the general relativity theory},
     publisher     = {Cambiridge University Press},
     address       = {Cambridge},
     year          = {1920},
     keywords      = {general relativity, Weyl's theory, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Pauli1919a,
     author        = {Pauli, W.},
     title         = {Zur Theorie der Gravitation und Elektrizit\"at von Hermann Weyl},
     journal       = {Phys. Z.},
     volume        = {20},
     pages         = {457--467},
     year          = {1919},
     keywords      = {Weyl's theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Pauli1919b,
     author        = {Pauli, W.},
     title         = {Mercurperihelbewegung und Strahlenablenkung in Weyls Gravitationstheorie},
     journal       = {Verh. Deutsch. Phys. Gesellsch.},
     volume        = {21},
     pages         = {742--750},
     year          = {1919},
     keywords      = {Weyl's theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{EinsteinFokker1914,
     author        = {Einstein, A. and Fokker, A. D.},
     title         = {Nordstr\"omsche Gravitationstheorie vom Standpunkt des absoluten Differentialkalk\"uls},
     journal       = {Ann. Phys.},
     volume        = {44},
     pages         = {321--328},
     year          = {1914},
     keywords      = {alternative theories of gravitation},
     ReferencedIn  = {lrr-2004-2}
}

@book{Pais1982,
     author        = {Pais, A.},
     title         = {`Subtle is the Lord'. The science and life of Albert Einstein},
     publisher     = {Oxford University Press},
     address       = {Oxford},
     year          = {1982},
     keywords      = {Einstein},
     ReferencedIn  = {lrr-2004-2}
}

@book{DeSabSchmu1983,
     editor        = {De Sabbata, V. and Schmutzer, E.},
     title         = {Unified field theories in more than 4 dimensions},
     publisher     = {World Scientific},
     address       = {Singapore},
     year          = {1983},
     keywords      = {Kaluza-Klein theories, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Eddington1921,
     author        = {Eddington, A.S.},
     title         = {A generalisation of Weyl's theory of the electromagnetic and gravitational fields},
     journal       = {Proc. R. Soc. London, Ser. A},
     volume        = {99},
     pages         = {104--122},
     year          = {1921},
     keywords      = {affine geometry, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@book{Eddington1933,
     author        = {Eddington, A.S.},
     title         = {The Expanding Universe},
     publisher     = {Cambridge University Press},
     address       = {Cambridge},
     year          = {1933},
     keywords      = {cosmology},
     ReferencedIn  = {lrr-2004-2}
}

@techreport{GoennerWuensch2003,
     title         = {What did Kaluza and Klein contribute to Kaluza-Klein-theory?},
     institution   = {Max-Planck-Institute for the History of Science},
     address       = {Berlin, Germany},
     year          = {2003},
     keywords      = {Kaluza-Klein theory},
     number        = {235},
     author        = {Goenner, H. and Wuensch, D.},
     ReferencedIn  = {lrr-2004-2}
}

@article{Mastrobisi2002,
     author        = {Mastrobisi, G.J.},
     title         = {Il `Manoscritto di Singapore' (1923) di Albert Einstein. Per una Teoria del `Campo Unificato' tra possibilit\`a fisica e necessit\`a matematica},
     journal       = {Nuncius},
     volume        = {17},
     pages         = {269--305},
     year          = {2002},
     keywords      = {affine theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1923a,
     author        = {Einstein, A.},
     title         = {Zur allgemeinen Relativit\"atstheorie},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {32--38},
     year          = {1923},
     keywords      = {affine geometry, unified field theory},
     number        = {5},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1923b,
     author        = {Einstein, A.},
     title         = {Bemerkungen zu meiner Arbeit `Zur allgemeinen Relativit\"atstheorie'},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {76--77},
     year          = {1923},
     keywords      = {affine geometry, unified field theory},
     number        = {12--14},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1923c,
     author        = {Einstein, A.},
     title         = {Zur affinen Feldtheorie},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {137--140},
     year          = {1923},
     keywords      = {affine geometry, unified field theory},
     number        = {17},
     ReferencedIn  = {lrr-2004-2}
}

@unpublished{MajSau2003,
     author        = {Majer, U. and Sauer, T.},
     title         = {Hilbert's world equations and his vision of a unified science},
     note          = {Preprint, Hilbert-Edition, University of G\"ottingen},
     keywords      = {affine geometry, unified field theory},
     year          = {2003},
     month         = {February},
     ReferencedIn  = {lrr-2004-2}
}

@article{Hilbert1915a,
     author        = {Hilbert, D.},
     title         = {Die Grundlagen der Physik (Erste Mitteilung)},
     journal       = {Nachr. Koenigl. Gesellsch. Wiss. Goettingen, Math.-Phys. Kl.},
     pages         = {395--407},
     year          = {1915},
     keywords      = {general relativity, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1923d,
     author        = {Einstein, A.},
     title         = {Bietet die Feldtheorie M\"oglichkeiten zur L\"osung des Quantenproblems?},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {359--364},
     year          = {1923},
     keywords      = {unified field theory, quantum theory, elementary particles},
     ReferencedIn  = {lrr-2004-2}
}

@article{EisenhartVeblen1922,
     author        = {Eisenhart, L.P. and Veblen, O.},
     title         = {The Riemann Geometry and its generalizations},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {8},
     pages         = {19--23},
     year          = {1922},
     keywords      = {affine geometry, geometry of paths},
     ReferencedIn  = {lrr-2004-2}
}

@book{Pauli1979,
     author        = {Pauli, W.},
     editor        = {Hermann, A. and Meyenn, K. v. and Weiskopf, V.F.},
     title         = {Wolfgang Pauli. Wissenschaftlicher Briefwechsel mit Bohr, Einstein, Heisenberg u.a, Bd. I: 1919-1929},
     publisher     = {Springer},
     address       = {New York, Heidelberg, Berlin},
     year          = {1979},
     keywords      = {history of science},
     ReferencedIn  = {lrr-2004-2}
}

@book{RZM1923,
     author        = {Weyl, H.},
     title         = {Raum, Zeit, Materie},
     publisher     = {Springer},
     address       = {Berlin},
     year          = {1923},
     keywords      = {differential geometry, general relativity, Weyl's theory, unified field theory},
     edition       = {5th, rev.},
     ReferencedIn  = {lrr-2004-2}
}

@book{Eddington1960,
     author        = {Eddington, A.S.},
     title         = {The Mathematical Theory of Relativity},
     publisher     = {Cambridge University Press},
     address       = {Cambridge},
     year          = {1960},
     keywords      = {differential geometry, general relativity, affine geometry, unified field theory},
     note          = {Reprint of the 1st ed. 1923},
     ReferencedIn  = {lrr-2004-2}
}

@book{Struik1934,
     author        = {Struik, D.J.},
     title         = {Theory of Linear Connections},
     publisher     = {Springer},
     address       = {Berlin},
     year          = {1934},
     keywords      = {differential geometry, linear connections},
     series        = {Ergebnisse der Mathematik und ihrer Grenzgebiete},
     volume        = {3},
     ReferencedIn  = {lrr-2004-2}
}

@article{Schouten1922a,
     author        = {Schouten, J.A.},
     title         = {\"Uber die verschiedenen Arten der \"Ubertragung in einer n-dimensionalen Mannigfaltigkeit, die einer Differentialgeometrie zugrundegelegt werden kann},
     journal       = {Math. Z.},
     volume        = {13},
     pages         = {56--81},
     year          = {1922},
     keywords      = {differential geometry, linear connections},
     ReferencedIn  = {lrr-2004-2}
}

@article{Schouten1922b,
     author        = {Schouten, J.A.},
     title         = {Nachtrag zur Arbeit `\"Uber die verschiedenen Arten der \"Ubertragung in einer n-dimensionalen Mannigfaltigkeit, die einer Differentialgeometrie zugrundegelegt werden kann.'},
     journal       = {Math. Z.},
     volume        = {15},
     pages         = {168},
     year          = {1922},
     keywords      = {differential geometry, linear connections},
     ReferencedIn  = {lrr-2004-2}
}

@book{Eddington1925,
     author        = {Eddington, A.S.},
     title         = {Relativit\"atstheorie in mathematischer Behandlung},
     publisher     = {Springer},
     address       = {Berlin},
     year          = {1925},
     keywords      = {differential geometry, general relativity, affine geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Schouten1923,
     author        = {Schouten, J.A.},
     title         = {On a non-symmetrical affine field theory},
     journal       = {Proc. K. Akad. Wetensch.},
     volume        = {26},
     pages         = {850--857},
     year          = {1923},
     keywords      = {mixed geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{FriedSchout1924,
     author        = {Friedmann, A. and Schouten, J.A.},
     title         = {\"Uber die Geometrie der halb-symmetrischen \"Ubertragungen},
     journal       = {Math. Z.},
     volume        = {21},
     pages         = {211--223},
     year          = {1924},
     keywords      = {semi-symmetric geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Eyraud1925a,
     author        = {Eyraud, H.},
     title         = {Sur le charact\`ere riemannien projectif du champ gravifique \'electromagn\'etique},
     journal       = {C. R. Acad. Sci.},
     volume        = {180},
     pages         = {127--129},
     year          = {1925},
     keywords      = {semi-symmetric geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Eyraud1925b,
     author        = {Eyraud, H.},
     title         = {La Th\'eorie affine asym\'etrique du champs \'electromagn\'etique et gravifique et le rayonnement atomique},
     journal       = {C. R. Acad. Sci.},
     volume        = {180},
     pages         = {1245--1248},
     year          = {1925},
     keywords      = {semi-symmetric geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Cartan1923,
     author        = {Cartan, E.},
     title         = {Sur les vari\'et\'es \`a connexion affine et la th\'eorie de la relativit\'e g\'en\'eralis\'ee},
     journal       = {Ann. Sci. Ecole Norm. Sup.},
     volume        = {40},
     pages         = {325--412},
     year          = {1923},
     keywords      = {affine connections, general relativity},
     ReferencedIn  = {lrr-2004-2}
}

@article{Eisenhart1922a,
     author        = {Eisenhart, L.P.},
     title         = {Fields of parallel vectors in the geometry of paths},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {8},
     pages         = {207--212},
     year          = {1922},
     keywords      = {geometry of paths},
     ReferencedIn  = {lrr-2004-2}
}

@article{Eisenhart1922b,
     author        = {Eisenhart, L.P.},
     title         = {Spaces with corresponding paths},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {8},
     pages         = {233--238},
     year          = {1922},
     keywords      = {geometry of paths},
     ReferencedIn  = {lrr-2004-2}
}

@article{Veblen1922,
     author        = {Veblen, O.},
     title         = {Projective and affine geometry of paths},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {8},
     pages         = {347--350},
     year          = {1922},
     keywords      = {geometry of paths},
     ReferencedIn  = {lrr-2004-2}
}

@article{Eisenhart1922/23,
     author        = {Eisenhart, L.P.},
     title         = {The geometry of paths and general relativity},
     journal       = {Ann. Math.},
     volume        = {24},
     pages         = {367--392},
     year          = {1922/23},
     keywords      = {geometry of paths, general relativity},
     ReferencedIn  = {lrr-2004-2}
}

@article{VeblenThom1923,
     author        = {Veblen, O. and Thomas, T.Y.},
     title         = {The geometry of paths},
     journal       = {Trans. Am. Math. Soc.},
     volume        = {25},
     pages         = {551--608},
     year          = {1923},
     keywords      = {geometry of paths, affine geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{FredIsak1929,
     author        = {Fr\'eedericksz, V. and Isakson, A.},
     title         = {Einige Bemerkungen \"uber die Feldgeometrie},
     journal       = {Phys. Z.},
     volume        = {30},
     pages         = {645},
     year          = {1929},
     keywords      = {connection, curvature, differential geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{JThomas1926,
     author        = {Thomas, J.M.},
     title         = {On various geometries giving a unified electric and gravitational theory},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {12},
     pages         = {187--191},
     year          = {1926},
     keywords      = {mixed geometry, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{TThomas1925a,
     author        = {Thomas, T.Y.},
     title         = {On the projective and equi-projective geometry of paths},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {11},
     pages         = {199--203},
     year          = {1925},
     keywords      = {geometry of paths, affine geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{TThomas1925b,
     author        = {Thomas,T.Y.},
     title         = {Note on the projective geometry of paths},
     journal       = {Bull. Am. Math. Soc.},
     volume        = {27},
     pages         = {318--322},
     year          = {1925},
     keywords      = {geometry of paths, affine geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Koenig1920,
     author        = {K\"onig, R.},
     title         = {Beitr\"age zu einer allgemeinen linearen Mannigfaltigkeitslehre},
     journal       = {Jahresber. Deutsch. Math.-Verein.},
     volume        = {28},
     pages         = {213--228},
     year          = {1919},
     keywords      = {linear connections},
     ReferencedIn  = {lrr-2004-2}
}

@article{Cartan1924,
     author        = {Cartan, E.},
     title         = {Sur les \'equations de structure des espaces g\'en\'eralis\'es et l`Univers optique},
     journal       = {C. R. Acad. Sci.},
     volume        = {174},
     pages         = {857--859},
     year          = {1922},
     keywords      = {linear connections},
     ReferencedIn  = {lrr-2004-2}
}

@article{Schouten1924c,
     author        = {Schouten, J.A.},
     title         = {Sur les connexions conformes et projectives de M. Cartan et la connexion lin\'eaire g\'en\'erale de M. K\"onig},
     journal       = {C. R. Acad. Sci.},
     volume        = {178},
     pages         = {2044--2046},
     year          = {1924},
     keywords      = {linear connections},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1945,
     author        = {Einstein, A.},
     title         = {A Generalization of the Relativistic Theory of Gravitation},
     journal       = {Ann. Math.},
     volume        = {46},
     pages         = {578--584},
     year          = {1945},
     keywords      = {unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1928a,
     author        = {Einstein, A.},
     title         = {Riemann-Geometrie mit Aufrechterhaltung des Begriffs des Fernparallelismus},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {217--221},
     year          = {1928},
     keywords      = {distant parallelism, unified field theory},
     number        = {17},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1928b,
     author        = {Einstein, A.},
     title         = {Neue M\"oglichkeit f\"ur eine einheitliche Feldtheorie von Gravitation und Elektrizit\"at},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {224--227},
     year          = {1928},
     keywords      = {distant parallelism, unified field theory},
     number        = {18},
     ReferencedIn  = {lrr-2004-2}
}

@book{Eisenhart1925a,
     author        = {Eisenhart, L.P.},
     title         = {Riemannian Geometry},
     publisher     = {Princeton University Press},
     address       = {Princeton},
     year          = {1925},
     keywords      = {differential geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{CartanSchouten1926b,
     author        = {Cartan, E. and Schouten, J.A.},
     title         = {On Riemaniann geometries admitting an absolute parallelism},
     journal       = {Proc. K. Akad. Wetensch.},
     volume        = {29},
     pages         = {933--946},
     year          = {1926},
     keywords      = {differential geometry, absolute parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{Cartan1926a,
     author        = {Cartan, E.},
     title         = {Sur les espaces de Riemann dans lesquels le transport par parall\'elism conserve la courbure},
     journal       = {Rend. Lincei},
     volume        = {6},
     pages         = {544--547},
     year          = {3},
     keywords      = {differential geometry, Riemannian manifolds},
     note          = {, (1926).},
     ReferencedIn  = {lrr-2004-2}
}

@article{CartanSchouten1926a,
     author        = {Cartan, E. and Schouten, J.A.},
     title         = {On the Geometry of the Group-manifold of Simple and Semi-simple Groups},
     journal       = {Proc. K. Akad. Wetensch.},
     volume        = {29},
     pages         = {803--815},
     year          = {1926},
     keywords      = {differential geometry, group manifolds, distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{Cartan1927,
     author        = {Cartan, E.},
     title         = {La G\'eom\'etrie des groupes de transformations},
     journal       = {J. Math. Pures Appl.},
     volume        = {6},
     pages         = {1--119},
     year          = {1927},
     keywords      = {differential geometry, group manifolds, distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@inbook{Havas1999,
     author        = {Havas, P.},
     editor        = {Goenner, H. and Renn, J. and Ritter, J. and Sauer, T.},
     title         = {Einstein, Relativity and Gravitation Research in Vienna before 1938},
     booktitle     = {The expanding worlds of general relativity},
     publisher     = {Birkh\"auser},
     address       = {Boston/Basel/Z\"urich},
     pages         = {87--125},
     year          = {1999},
     keywords      = {history of relativity and cosmology},
     ReferencedIn  = {lrr-2004-2}
}

@article{Weitz1928,
     author        = {Weitzenb\"ock, R.},
     title         = {Differentialinvarianten in der Einsteinschen Theorie des Fernparallelismus},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {466--474},
     year          = {1928},
     keywords      = {differential invariants, distant parallelism},
     number        = {26},
     ReferencedIn  = {lrr-2004-2}
}

@article{Cartan1930,
     author        = {Cartan, E.},
     title         = {Notice historique sur la notion de parall\'elisme absolu},
     journal       = {Math. Ann.},
     volume        = {102},
     pages         = {698--706},
     year          = {1930},
     keywords      = {distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1930a,
     author        = {Einstein, A.},
     title         = {Auf die Riemann-Metrik und den Fernparallelismus gegr\"undete einheitliche Feldtheorie},
     journal       = {Math. Ann.},
     volume        = {102},
     pages         = {685--697},
     year          = {1930},
     keywords      = {distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@phdthesis{Biezunski1981,
     author        = {Biezunski, M.},
     title         = {La diffusion de la th\'eorie de la relativit\'e en France},
     school        = {Universit\'e VII, D\'epartement de Didactique des Sciences physiques et de la Technologie},
     address       = {Paris},
     year          = {1981},
     keywords      = {History of physics},
     type          = {PhD Thesis},
     ReferencedIn  = {lrr-2004-2}
}

@inbook{Einstein1929d,
     author        = {Einstein, A.},
     editor        = {Honegger, E.},
     title         = {\"Uber den gegenw\"artigen Stand der Feldtheorie},
     booktitle     = {Prof. Dr. A. Stodola. \"Uberreicht von seinen Freunden und Sch\"ulern},
     publisher     = {Orell F\"ussli},
     address       = {Z\"urich und Leipzig},
     year          = {1929},
     keywords      = {distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{vanDantzig1934a,
     author        = {van Dantzig, D.},
     title         = {The fundamental equations of electromagnetism, independent of metrical geometry},
     journal       = {Proc. Cambridge Philos. Soc.},
     volume        = {30},
     pages         = {421--427},
     year          = {1934},
     keywords      = {A-geometrical theories},
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}

@article{vanDantzig1934b,
     author        = {van Dantzig, D.},
     title         = {Electromagnetism, independent of metrical geometry. 1. The foundations},
     journal       = {Proc. K. Akad. Wetensch.},
     volume        = {37},
     pages         = {521--525},
     year          = {1934},
     keywords      = {A-geometrical theories},
     ReferencedIn  = {lrr-2004-2}
}

@article{vanDantzig1934c,
     author        = {van Dantzig, D.},
     title         = {Electromagnetism, independent of metrical geometry. 2. Variational Principles and further generalization of the theory},
     journal       = {Proc. K. Akad. Wetensch.},
     volume        = {37},
     pages         = {526--531},
     year          = {1934},
     keywords      = {A-geometrical theories},
     ReferencedIn  = {lrr-2004-2}
}

@article{vanDantzig1934d,
     author        = {van Dantzig, D.},
     title         = {Electromagnetism, independent of metrical geometry. 3. Mass and motion},
     journal       = {Proc. K. Akad. Wetensch.},
     volume        = {37},
     pages         = {644--652},
     year          = {1934},
     ReferencedIn  = {lrr-2004-2}
}

@article{vanDantzig1934e,
     author        = {van Dantzig, D.},
     title         = {Electromagnetism, independent of metrical geometry. 4. Momentum and energy: waves},
     journal       = {Proc. K. Akad. Wetensch.},
     volume        = {37},
     pages         = {825--863},
     year          = {1934},
     keywords      = {A-geometrical theories},
     ReferencedIn  = {lrr-2004-2}
}

@article{NewsandViews1929,
     title         = {News and Views},
     journal       = {Nature},
     volume        = {123},
     pages         = {174--175},
     year          = {1929},
     keywords      = {distant parallelism, unified field theory},
     number        = {3092},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1929c,
     author        = {Einstein, A.},
     title         = {The New Field Theory I, II},
     journal       = {Observatory},
     volume        = {51},
     pages         = {82--87, 114--118},
     year          = {1929},
     keywords      = {history of physics, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Piaggio1929,
     author        = {Piaggio, H.T.M.},
     title         = {Einstein's and other Unitary Field Theories: An Explanation for the General Reader},
     journal       = {Nature},
     volume        = {123},
     pages         = {839--841, 877--879},
     year          = {1929},
     keywords      = {Unified field theory},
     number        = {3109, 3110},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1930c,
     author        = {Einstein, A.},
     title         = {Zur Theorie der R\"aume mit Riemann-Metrik und Fernparallelismus},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {1--2},
     year          = {1930},
     keywords      = {distant parallelism, unified field theory},
     number        = {6},
     ReferencedIn  = {lrr-2004-2}
}

@inbook{Yang1986,
     author        = {Yang, C.N.},
     editor        = {Chandrasekharan, K.},
     title         = {Hermann Weyl's Contribution to Physics},
     booktitle     = {Hermann Weyl 1885-1985. Centenary lectures},
     publisher     = {Springer},
     address       = {Berlin/Heidelberg/New York},
     pages         = {6--21},
     year          = {1986},
     keywords      = {History of mathematics, history of physics},
     ReferencedIn  = {lrr-2004-2}
}

@article{Weyl1929a,
     author        = {Weyl, H.},
     title         = {Elektron und Gravitation I},
     journal       = {Z. Phys.},
     volume        = {56},
     pages         = {330--352},
     year          = {1929},
     keywords      = {gauge theory, electron spin},
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}

@article{Weyl1929b,
     author        = {Weyl, H.},
     title         = {Gravitation and the electron},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {15},
     pages         = {323--334},
     year          = {1929},
     keywords      = {gauge theory, electron spin},
     ReferencedIn  = {lrr-2004-2}
}

@article{Wirtinger1922,
     author        = {Wirtinger, W.},
     title         = {On a general infinitesimal geometry in reference to the theory of relativity},
     journal       = {Trans. Cambridge Philos. Soc.},
     volume        = {22},
     pages         = {439--448},
     year          = {1922},
     keywords      = {differential geometry, relativity},
     ReferencedIn  = {lrr-2004-2}
}

@article{Eisenhart1923,
     author        = {Eisenhart, L.P.},
     title         = {Another interpretation of the fundamental gauge vector of Weyl's theory of relativity},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {9},
     pages         = {175--178},
     year          = {1923},
     keywords      = {Weyl's theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Dienes1923,
     author        = {Dienes, P.},
     title         = {Sur la th\'eorie \'electromagn\'etique relativiste},
     journal       = {C. R. Acad. Sci.},
     volume        = {176},
     pages         = {238--241},
     year          = {1923},
     keywords      = {Weyl's theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Eisenhart1925b,
     author        = {Eisenhart, L.P.},
     title         = {Linear connections of a space which are determined by simply transitive continuous groups},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {11},
     pages         = {246--249},
     year          = {1925},
     keywords      = {distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@book{Grun1990,
     author        = {Gr\"uning, M.},
     title         = {Ein Haus f\"ur Albert Einstein. Erinnerungen, Briefe, Dokumente},
     publisher     = {Verlag der Nation},
     address       = {Berlin},
     year          = {1990},
     keywords      = {history of science, Einstein},
     ReferencedIn  = {lrr-2004-2}
}

@book{EinsteinBorn1982,
     author        = {Einstein, A. and Born, H. and Born, M.},
     title         = {Albert Einstein, Hedwig und Max Born, Briefwechsel: 1916-1955 / kommentiert von Max Born; Geleitwort von Bertrand Russell; Vorwort von Werner Heisenberg},
     publisher     = {Edition Erbrich},
     address       = {Frankfurt am Main},
     year          = {1982},
     keywords      = {history of science},
     ReferencedIn  = {lrr-2004-2}
}

@unpublished{Sauer2003,
     author        = {Sauer, T.},
     title         = {Field equations in teleparallel spacetime: Einstein's Fernparallelismus approach towards unified field theory},
     note          = {Preprint, Einstein Papers Project, California Institute of Technology, Pasadena},
     keywords      = {distant parallelism, history of science},
     year          = {2003},
     month         = {October},
     ReferencedIn  = {lrr-2004-2}
}

@inbook{Biezunski1989,
     author        = {Biezunski, M.},
     editor        = {Howard, D. and Stachel, J.},
     title         = {Inside the coconut: The Einstein-Cartan discussion},
     booktitle     = {Einstein and the History of General Relativity},
     publisher     = {Birkh\"auser},
     address       = {Boston/Basel/Berlin},
     pages         = {315--324},
     year          = {1989},
     keywords      = {distant parallelism, history of science},
     series        = {Einstein Studies},
     volume        = {1},
     ReferencedIn  = {lrr-2004-2}
}

@article{Reichenbach1929,
     author        = {Reichenbach, H.},
     title         = {Zur Einordnung des neuen Einsteinschen Ansatzes \"uber Gravitation und Elektrizit\"at},
     journal       = {Z. Phys.},
     volume        = {53},
     pages         = {683--689},
     year          = {1929},
     keywords      = {Distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{Schouten1929a,
     author        = {Schouten, J.A.},
     title         = {Sur la signification g\'eom\'etrique de la propri\'et\'e semi-symm\'etrique d'une connexion int\'egrale, qui laisse invariant le tenseur fondamental},
     journal       = {C. R. Acad. Sci.},
     volume        = {188},
     pages         = {1135--1136},
     year          = {1929},
     keywords      = {Distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{Grommer1929,
     author        = {Grommer, J.},
     title         = {Eine kleine Bemerkung zur neuen Einsteinschen Feldtheorie},
     journal       = {Phys. Z.},
     volume        = {30},
     pages         = {645},
     year          = {1929},
     keywords      = {distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{LeviCivita1929a,
     author        = {Levi-Civita, T.},
     title         = {Vereinfachte Herstellung der Einsteinschen einheitlichen Feldgleichungen},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {137--153},
     year          = {1929},
     keywords      = {distant parallelism},
     number        = {IX},
     ReferencedIn  = {lrr-2004-2}
}

@article{LeviCivita1929b,
     author        = {Levi-Civita, T.},
     title         = {A proposed modification of Einstein's field theory},
     journal       = {Nature},
     volume        = {123},
     pages         = {678--679},
     year          = {1929},
     keywords      = {distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{McVittie1929,
     author        = {McVittie, G.C.},
     title         = {On Einstein's Unified Field Theory},
     journal       = {Proc. R. Soc. London, Ser. A},
     volume        = {124},
     pages         = {366--374},
     year          = {1929},
     keywords      = {distant parallelism, exact solutions},
     ReferencedIn  = {lrr-2004-2}
}

@book{LeviCivita1925,
     author        = {Levi-Civita, T.},
     title         = {Lezioni di calcolo differenziale assoluto},
     publisher     = {Stock},
     address       = {Roma},
     year          = {1925},
     keywords      = {differential geometry, general relativity},
     ReferencedIn  = {lrr-2004-2}
}

@article{McVittie1931,
     author        = {McVittie, G.C.},
     title         = {Solution with axial symmetry of Einstein's equations of teleparallelism},
     journal       = {Proc. Edinburgh Math. Soc.},
     volume        = {2},
     pages         = {140},
     year          = {1931},
     keywords      = {distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{Infeld1928a,
     author        = {Infeld, L.},
     title         = {Zur Feldtheorie von Elektrizit\"at und Gravitation},
     journal       = {Phys. Z.},
     volume        = {29},
     pages         = {145--147},
     year          = {1928},
     keywords      = {affine geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Hattori1928,
     author        = {Hattori, K.},
     title         = {\"Uber eine formale Erweiterung der Relativit\"atstheorie und ihren Zusammenhang mit der Theorie der Elektrizit\"at},
     journal       = {Phys. Z.},
     volume        = {29},
     pages         = {538 - 549},
     year          = {1928},
     keywords      = {metric-affine geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Kosambi1932,
     author        = {Kosambi, D.},
     title         = {Affin-geometrische Grundlagen der einheitlichen Feldtheorie},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {342--345},
     year          = {1932},
     keywords      = {affine geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Kunii1931,
     author        = {Kunii, S.},
     title         = {On a unified field theory of gravitational and electromagnetic fields},
     journal       = {Mem. Coll. Sci. Kyoto Univ., Ser. A},
     volume        = {14},
     pages         = {195--212},
     year          = {1931},
     keywords      = {unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Hosokawa1932,
     author        = {Hosokawa, T.},
     title         = {Connections in the manifold admitting generalized transformations},
     journal       = {Proc. Imp. Acad. Japan},
     volume        = {8},
     pages         = {348--351},
     year          = {1932},
     keywords      = {differential geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Kawaguchi1932,
     author        = {Kawaguchi, A.},
     title         = {Die Differentialgeometrie in der verallgemeinerten Mannigfaltigkeit},
     journal       = {Rend. Circ. Mat. Palermo},
     volume        = {56},
     pages         = {245--276},
     year          = {1932},
     keywords      = {differential geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Infeld1928b,
     author        = {Infeld, L.},
     title         = {Bemerkungen zu der Arbeit von Herrn K. Hattori},
     journal       = {Phys. Z.},
     volume        = {29},
     pages         = {810--811},
     year          = {1928},
     keywords      = {metric-affine geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Sen1927,
     author        = {Sen, N.R.},
     title         = {Der Energieinhalt des elektrischen Teilchens nach den Einsteinschen modifizierten Feldgleichungen},
     journal       = {Z. Phys.},
     volume        = {40},
     pages         = {667--674},
     year          = {1927},
     ReferencedIn  = {lrr-2004-2}
}

@article{Sen1930a,
     author        = {Sen, N.R.},
     title         = {Das Keplerproblem der f\"unfdimensionalen Wellenmechanik und der Einfluss der Gravitation auf die Balmerformel},
     journal       = {Z. Phys.},
     volume        = {66},
     pages         = {689--692},
     year          = {1930},
     keywords      = {Kaluza-Klein, wave mechanics},
     ReferencedIn  = {lrr-2004-2}
}

@article{Sen1930b,
     author        = {Sen, N.R.},
     title         = {Die relativistisch-wellenmechanische Bewegung des materiellen Teilchens im homogenen Magnetfeld},
     journal       = {Z. Phys.},
     volume        = {66},
     pages         = {693--696},
     year          = {1930},
     keywords      = {Kaluza-Klein, wave mechanics},
     ReferencedIn  = {lrr-2004-2}
}

@article{GagLeit1986,
     author        = {Lopes Gagean, D. and Costa Leite, M.},
     title         = {A theoria de Kaluza-Klein},
     journal       = {Analise (Lisboa)},
     volume        = {5},
     pages         = {151--198},
     year          = {1986},
     ReferencedIn  = {lrr-2004-2}
}

@article{Straneo1931a,
     author        = {Straneo, P.},
     title         = {Gleichungen zu einer einheitlichen Feldtheorie},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {319--325},
     year          = {1931},
     keywords      = {Distant parallelism},
     number        = {13},
     ReferencedIn  = {lrr-2004-2}
}

@article{Straneo1931b,
     author        = {Straneo, P.},
     title         = {Teorie unitarie della gravitazione e dell'electricita},
     journal       = {Nuovo Cimento},
     volume        = {8},
     pages         = {125--145},
     year          = {1931},
     keywords      = {Distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{Straneo1932,
     author        = {Straneo, P.},
     title         = {I tensori energetici nella teoria unitaria a geometrizzazione assoluta},
     journal       = {Rend. Lincei},
     volume        = {15},
     pages         = {563--568},
     year          = {1932},
     keywords      = {Distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{Mandel1929c,
     author        = {Mandel, H.},
     title         = {\"Uber den Zusammenhang zwischen der Einsteinschen Theorie des Fernparallelismus und der f\"unfdimensionalen Feldtheorie},
     journal       = {Z. Phys.},
     volume        = {56},
     pages         = {838--844},
     year          = {1929},
     keywords      = {Distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{Proca1929a,
     author        = {Proca, A.},
     title         = {La nouvelle th\'eorie d'Einstein},
     journal       = {Bull. Math. Soc. Roumaine Sci.},
     volume        = {1},
     pages         = {170--176},
     year          = {1929},
     keywords      = {Distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{Proca1929b,
     author        = {Proca, A.},
     title         = {La nouvelle th\'eorie d'Einstein. II},
     journal       = {Bull. Math. Soc. Roumaine Sci.},
     volume        = {2},
     pages         = {15--22},
     year          = {1929},
     keywords      = {Distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{Zaycoff1929a,
     author        = {Zaycoff, R.},
     title         = {Zur Begr\"undung einer neuen Feldtheorie von A. Einstein},
     journal       = {Z. Phys.},
     volume        = {53},
     pages         = {719--728},
     year          = {1929},
     keywords      = {distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{Zaycoff1929b,
     author        = {Zaycoff, R.},
     title         = {Zur Begr\"undung einer neuen Feldtheorie von A. Einstein. II},
     journal       = {Z. Phys.},
     volume        = {54},
     pages         = {590--593},
     year          = {1929},
     keywords      = {distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{Zaycoff1929c,
     author        = {Zaycoff, R.},
     title         = {Zur Begr\"undung einer neuen Feldtheorie von A. Einstein. III},
     journal       = {Z. Phys.},
     volume        = {54},
     pages         = {738--740},
     year          = {1929},
     keywords      = {distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{Zaycoff1929d,
     author        = {Zaycoff, R.},
     title         = {Zu der neuesten Formulierung der Einsteinschen einheitlichen Feldtheorie},
     journal       = {Z. Phys.},
     volume        = {56},
     pages         = {717--726},
     year          = {1929},
     keywords      = {distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{Zaycoff1929e,
     author        = {Zaycoff, R.},
     title         = {Zur neuen Quantentheorie},
     journal       = {Z. Phys.},
     volume        = {54},
     pages         = {588--589},
     year          = {1929},
     keywords      = {Dirac equation, quantum theory, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Zaycoff1929f,
     author        = {Zaycoff, R.},
     title         = {Fernparallelismus und Wellenmechanik},
     journal       = {Z. Phys.},
     volume        = {58},
     pages         = {833--840},
     year          = {1929},
     keywords      = {distant parallelism, quantum mechanics},
     ReferencedIn  = {lrr-2004-2}
}

@article{Zaycoff1929g,
     author        = {Zaycoff, R.},
     title         = {Fernparallelismus und Wellenmechanik. II},
     journal       = {Z. Phys.},
     volume        = {59},
     pages         = {110--113},
     year          = {1929},
     keywords      = {distant parallelism, quantum mechanics},
     ReferencedIn  = {lrr-2004-2}
}

@article{Tamm1929a,
     author        = {Tamm, I.},
     title         = {\"Uber den Zusammenhang der Einsteinschen einheitlichen Feldtheorie mit der Quantentheorie},
     journal       = {Proc. R. Acad. Amsterdam},
     volume        = {32},
     pages         = {288--291},
     year          = {1929},
     keywords      = {unified field theory, quantum theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Tamm1929b,
     author        = {Tamm, I.},
     title         = {Die Einsteinsche einheitliche Feldtheorie und die Quantentheorie},
     journal       = {Phys. Z.},
     volume        = {30},
     pages         = {652--654},
     year          = {1929},
     keywords      = {unified field theory, quantum theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{TammLeonto1929b,
     author        = {Tamm, I. and Leontowitsch, M.},
     title         = {Bemerkungen zur Einsteinschen einheitlichen Feldtheorie},
     journal       = {Z. Phys.},
     volume        = {57},
     pages         = {354--366},
     year          = {1929},
     keywords      = {unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{WienerVallarta1929a,
     author        = {Wiener, N. and Vallarta, M.S.},
     title         = {On the spherically symmetric statical field in Einstein's unified theory of electromagnetism and gravitation},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {15},
     pages         = {353--356},
     year          = {1929},
     keywords      = {unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Salkover1930a,
     author        = {Salkover, M.},
     title         = {The Unified Filed-Theory and Schwarzschild's solution. I},
     journal       = {Phys. Rev.},
     volume        = {35},
     pages         = {209},
     year          = {1930},
     keywords      = {distant parallelism, unified field theory, Schwarzschild solution},
     ReferencedIn  = {lrr-2004-2}
}

@article{Salkover1930b,
     author        = {Salkover, M.},
     title         = {The Unified Filed-Theory and Schwarzschild's solution. II},
     journal       = {Phys. Rev.},
     volume        = {35},
     pages         = {214},
     year          = {1930},
     keywords      = {distant parallelism, unified field theory, Schwarzschild solution},
     ReferencedIn  = {lrr-2004-2}
}

@article{WienerVallarta1929b,
     author        = {Wiener, N. and Vallarta, M.S.},
     title         = {On the spherically symmetric statical field in Einstein's unified theory of electromagnetism and gravitation: A correction},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {15},
     pages         = {802--804},
     year          = {1929},
     keywords      = {distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{WienerVallarta1929c,
     author        = {Wiener, N. and Vallarta, M. S.},
     title         = {Unified field theory with electricity and gravitation},
     journal       = {Nature},
     volume        = {123},
     pages         = {317},
     year          = {1929},
     keywords      = {unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Vallarta1929,
     author        = {Vallarta, M.S.},
     title         = {On Einstein's unified field equations and the Schwarzschild solution},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {15},
     pages         = {784--788},
     year          = {1929},
     keywords      = {distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1929a,
     author        = {Einstein, A.},
     title         = {Zur einheitlichen Feldtheorie},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {2--7},
     year          = {1929},
     keywords      = {distant parallelism, unified field theory},
     number        = {I},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1929b,
     author        = {Einstein, A.},
     title         = {Einheitliche Feldtheorie und Hamiltonsches Prinzip},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {156--159},
     year          = {1929},
     keywords      = {distant parallelism, unified field theory},
     number        = {10},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1930b,
     author        = {Einstein, A.},
     title         = {Die Kompatibilit\"at der Feldgleichungen in der einheitlichen Feldtheorie},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {18--23},
     year          = {1930},
     keywords      = {distant parallelism, unified field theory},
     number        = {1},
     ReferencedIn  = {lrr-2004-2}
}

@article{Zaycoff1930a,
     author        = {Zaycoff, R.},
     title         = {Das relativistische Elektron},
     journal       = {Z. Phys.},
     volume        = {61},
     pages         = {395--410},
     year          = {1930},
     keywords      = {distant parallelism, unified field theory, relativistic electron},
     ReferencedIn  = {lrr-2004-2}
}

@article{EinsteinMayer1930,
     author        = {Einstein, A. and Mayer, W.},
     title         = {Zwei strenge statische L\"osungen der Feldgleichungen der einheitlichen Feldtheorie},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {110--120},
     year          = {1930},
     keywords      = {distant parallelism, unified field theory},
     number        = {6},
     ReferencedIn  = {lrr-2004-2}
}

@article{EinsteinMayer1931a,
     author        = {Einstein, A. and Mayer, W.},
     title         = {Systematische Untersuchung \"uber kompatible Feldgleichungen, welche in einem Riemannschen Raume mit Fernparallelismus gesetzt werden k\"onnen},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {257--265},
     year          = {1931},
     keywords      = {distant parallelism, unified field theory},
     number        = {13},
     ReferencedIn  = {lrr-2004-2}
}

@article{Swann1930,
     author        = {Swann, W.F.G.},
     title         = {Statement in regard to professor Einstein's publications},
     journal       = {Science},
     volume        = {71},
     pages         = {390--391},
     year          = {1930},
     keywords      = {distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@book{Einstein1956,
     author        = {Einstein, A.},
     title         = {Briefe an Maurice Solovine},
     publisher     = {Gauthier-Villars},
     address       = {Paris},
     year          = {1956},
     keywords      = {History of science, Einstein},
     ReferencedIn  = {lrr-2004-2}
}

@book{Reichenbach1928,
     author        = {Reichenbach, H.},
     title         = {Philosophie der Raum-Zeit-Lehre},
     publisher     = {de Gruyter},
     address       = {Berlin},
     year          = {1928},
     keywords      = {distant parallelism, differential geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Bargmann1930,
     author        = {Bargmann, V.},
     title         = {\"Uber eine Verallgemeinerung des Einsteinschen Raumtyps},
     journal       = {Z. Phys.},
     volume        = {65},
     pages         = {830--847},
     year          = {1930},
     keywords      = {Affine geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Eddington1929,
     author        = {Eddington, A.S.},
     title         = {Einstein's Field-Theory},
     journal       = {Nature},
     volume        = {123},
     pages         = {280--281},
     year          = {1929},
     keywords      = {distant parallelism, unified field theory},
     number        = {3095},
     ReferencedIn  = {lrr-2004-2}
}

@article{RosenVallarta1930,
     author        = {Rosen, N. and Vallarta, M.S.},
     title         = {The spherically symmetrical field in the unified theory},
     journal       = {Phys. Rev.},
     volume        = {36},
     pages         = {110--120},
     year          = {1930},
     keywords      = {unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Bortolotti1927,
     author        = {Bortolotti, E.},
     title         = {On metric connections with absolute parallelism},
     journal       = {Proc. K. Akad. Wetensch.},
     volume        = {30},
     pages         = {216--218},
     year          = {1927},
     keywords      = {distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Bortolotti1928a,
     author        = {Bortolotti, E.},
     title         = {Parallelismo assoluto nella variet\'a a connessione affine e nuove veduti sulla relativit\'a},
     journal       = {Mem. Accad. Sci. Ist. Bologna, Cl. Sci. Fis.},
     volume        = {6},
     pages         = {45--58},
     year          = {1928},
     keywords      = {distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Bortolotti1928b,
     author        = {Bortolotti, E.},
     title         = {Stelle di congruenze e parallelisme assoluto: basi geometriche di una recente teoria di Einstein},
     journal       = {Rend. Lincei},
     volume        = {9},
     pages         = {530--538},
     year          = {1929},
     keywords      = {distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Palatini1929,
     author        = {Palatini, A.},
     title         = {Intorno alla nuova teoria di Einstein},
     journal       = {Rend. Lincei},
     volume        = {9},
     pages         = {633--639},
     year          = {1929},
     keywords      = {distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@inbook{EinsteinGrom1923,
     author        = {Einstein, A. and Grommer, J.},
     editor        = {Einstein, A.},
     title         = {Beweis der Nichtexistenz eines \"uberall regul\"aren zentrisch symmetrischen Feldes nach der Feldtheorie von Kaluza},
     booktitle     = {Mathematica et physica},
     publisher     = {Hebrew University},
     address       = {Jerusalem},
     pages         = {1--4},
     year          = {1923},
     keywords      = {Kaluza-Klein},
     series        = {Scripta Hierosolymitana},
     number        = {7},
     volume        = {1},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1925a,
     author        = {Einstein, A.},
     title         = {Einheitliche Feldtheorie von Gravitation und Elektrizit\"at},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {414--419},
     year          = {1925},
     keywords      = {Mixed geometry, unified field theory},
     number        = {22},
     ReferencedIn  = {lrr-2004-2}
}

@book{JauchRohrlich1980,
     author        = {Jauch, J.M. and Rohrlich, F.},
     title         = {The theory of photons and electrons},
     publisher     = {Springer},
     address       = {Berlin/Heidelberg},
     year          = {1980},
     keywords      = {Quantum electrodynamics, electrons},
     edition       = {2nd, exp.},
     ReferencedIn  = {lrr-2004-2}
}

@article{Watanabe1951,
     author        = {Watanabe, S.},
     title         = {Reversibility of Quantum-Electrodynamics},
     journal       = {Phys. Rev.},
     volume        = {84},
     pages         = {1008--1025},
     year          = {1951},
     keywords      = {time-reversal},
     ReferencedIn  = {lrr-2004-2}
}

@article{Treder1975,
     author        = {Treder, H.-J.},
     title         = {Der heutige Stand der Geometrisierung der Physik und der Physikalisierung der Geometrie},
     journal       = {Sitzungsber. Akad. Wiss. DDR, Math.-Nat.-Technik},
     pages         = {1--33},
     year          = {1975},
     keywords      = {History of unified field theory},
     number        = {14/N},
     ReferencedIn  = {lrr-2004-2}
}

@inbook{Bargmann1960,
     author        = {Bargmann, V.},
     title         = {Relativity},
     booktitle     = {Theoretical Physics in the Twentieth Century},
     publisher     = {Interscience Publishers},
     address       = {New York},
     pages         = {187--198},
     year          = {1960},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1925b,
     author        = {Einstein, A.},
     title         = {Elektron und allgemeine Relativit\"atstheorie},
     journal       = {Physica},
     volume        = {5},
     pages         = {330--334},
     year          = {1925},
     keywords      = {charge symmetry, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Rainich1924a,
     author        = {Rainich, G.Y.},
     title         = {Electrodynamics in General Relativity Theory},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {10},
     pages         = {124--127},
     year          = {1924},
     keywords      = {Maxwell's theory, general relativity},
     ReferencedIn  = {lrr-2004-2}
}

@article{Rainich1924b,
     author        = {Rainich, G.Y.},
     title         = {Second Note. Electrodynamics in General Relativity Theory},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {10},
     pages         = {294--298},
     year          = {1924},
     keywords      = {Maxwell's theory, general relativity},
     ReferencedIn  = {lrr-2004-2}
}

@article{Rainich1925a,
     author        = {Rainich, G.Y.},
     title         = {Electricity in Curved Space},
     journal       = {Nature},
     volume        = {115},
     pages         = {498},
     year          = {1925},
     keywords      = {Maxwell's theory, general relativity},
     ReferencedIn  = {lrr-2004-2}
}

@article{Rainich1925b,
     author        = {Rainich, G.Y.},
     title         = {Electrodynamics in general relativity},
     journal       = {Trans. Am. Math. Soc.},
     volume        = {27},
     pages         = {106},
     year          = {1925},
     keywords      = {Maxwell's theory, general relativity},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1926/27,
     author        = {Einstein, A.},
     title         = {\"Uber die formale Beziehung des Riemannschen Kr\"ummungstensors zu den Feldgleichungen der Gravitation},
     journal       = {Math. Ann.},
     volume        = {97},
     pages         = {99--103},
     year          = {1926/27},
     keywords      = {unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Klein1926a,
     author        = {Klein, O.},
     title         = {Quanten-Theorie und 5-dimensionale Relativit\"atstheorie},
     journal       = {Z. Phys.},
     volume        = {37},
     pages         = {895--906},
     year          = {1926},
     keywords      = {Kaluza-Klein theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1927a,
     author        = {Einstein, A.},
     title         = {Zu Kaluzas Theorie des Zusammenhangs von Gravitation und Elektrizit\"at (1. Mitteilung)},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {23--25},
     year          = {1927},
     keywords      = {Kaluza-Klein theory},
     number        = {6},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1927b,
     author        = {Einstein, A.},
     title         = {Zu Kaluzas Theorie des Zusammenhangs von Gravitation und Elektrizit\"at (2. Mitteilung)},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {26--30},
     year          = {1927},
     keywords      = {Kaluza-Klein theory},
     number        = {6},
     ReferencedIn  = {lrr-2004-2}
}

@article{Klein1926b,
     author        = {Klein, O.},
     title         = {The Atomicity of Electricity as a Quantum Law},
     journal       = {Nature},
     volume        = {118},
     pages         = {516},
     year          = {1926},
     keywords      = {Kaluza-Klein theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Klein1926c,
     author        = {Klein, O.},
     title         = {Elektrodynamik und Wellenmechanik vom Standpunkt des Korrespondenzprinzips},
     journal       = {Z. Phys.},
     volume        = {41},
     pages         = {407--442},
     year          = {1927},
     keywords      = {Kaluza-Klein theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Fock1926,
     author        = {Fock, V.},
     title         = {\"Uber die invariante Form der Wellen- und der Bewegungsgleichung f\"ur einen geladenen Massenpunkt},
     journal       = {Z. Phys.},
     volume        = {39},
     pages         = {226--232},
     year          = {1926},
     keywords      = {Kaluza-Klein theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Mandel1926,
     author        = {Mandel, H.},
     title         = {Zur Herleitung der Feldgleichungen in der allgemeinen Relativit\"atstheorie. Erste Mitteilung},
     journal       = {Z. Phys.},
     volume        = {39},
     pages         = {136--145},
     year          = {1926},
     keywords      = {Kaluza-Klein theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Klein1928,
     author        = {Klein, O.},
     title         = {Zur f\"unfdimensionalen Darstellung der Relativit\"atstheorie},
     journal       = {Z. Phys.},
     volume        = {46},
     pages         = {188--208},
     year          = {1928},
     keywords      = {Kaluza-Klein theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Mandel1927,
     author        = {Mandel, H.},
     title         = {Zur Herleitung der Feldgleichungen in der allgemeinen Relativit\"atstheorie. 2. Mitteilung},
     journal       = {Z. Phys.},
     volume        = {45},
     pages         = {285--306},
     year          = {1927},
     keywords      = {Kaluza-Klein theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Mandel1929d,
     author        = {Mandel, H.},
     title         = {\"Uber den Zusammenhang zwischen der Einsteinschen Theorie des Fernparallelismus und der f\"unfdimensionalen Feldtheorie},
     journal       = {Z. Phys.},
     volume        = {56},
     pages         = {838--844},
     year          = {1929},
     keywords      = {Kaluza-Klein theory, projective geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Reichenbaecher1928a,
     author        = {Reichenb\"acher, E.},
     title         = {Die 5-dimensionale Relativit\"atstheorie und das komplexe Linienelement},
     journal       = {Z. Phys.},
     volume        = {50},
     pages         = {425--432},
     year          = {1928},
     keywords      = {Kaluza-Klein theory, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{EinsteinBergmann1938,
     author        = {Einstein, A. and Bergmann, P.},
     title         = {On a generalization of Kaluza's theory of electricity},
     journal       = {Ann. Math.},
     volume        = {39},
     pages         = {683--701},
     year          = {1938},
     keywords      = {Kaluza-Klein theory, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Reichenbaecher1927,
     author        = {Reichenb\"acher, E.},
     title         = {Die Kopplung des Elektromagnetismus mit der Gravitation},
     journal       = {Z. Phys.},
     volume        = {44},
     pages         = {517--534},
     year          = {1927},
     keywords      = {Kaluza-Klein theory, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{deBroglie1927a,
     author        = {de Broglie, L.},
     title         = {L'univers \`a cinq dimensions et la m\'ecanique ondulatoire},
     journal       = {J. Phys. Radium},
     volume        = {8},
     pages         = {65--73},
     year          = {1927},
     keywords      = {Kaluza-Klein theory, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{deBroglie1927b,
     author        = {de Broglie, L.},
     title         = {R\'eponse \`a la note de M. O. Klein},
     journal       = {J. Phys. Radium},
     volume        = {8},
     pages         = {244},
     year          = {1927},
     keywords      = {Kaluza-Klein theory, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Klein1927a,
     author        = {Klein, O.},
     title         = {Sur l'article de M. L. de Broglie: `L'univers \`a cinq dimensions et la m\'echanique ondulatoire'},
     journal       = {J. Phys. Radium},
     volume        = {8},
     pages         = {242--243},
     year          = {1927},
     keywords      = {Kaluza-Klein theory, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Darrieus1927,
     author        = {Darrieus, M.G.},
     title         = {Sur une form remarquable des \'equations de Maxwell-Lorentz dans l'univers \`a cinq dimensions},
     journal       = {J. Phys. Radium},
     volume        = {8},
     pages         = {444--446},
     year          = {1927},
     keywords      = {Kaluza-Klein theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Mandel1929a,
     author        = {Mandel, H.},
     title         = {Zur Axiomatik der 5-dimensionalen Relativit\"atstheorie},
     journal       = {Z. Phys.},
     volume        = {54},
     pages         = {564--566},
     year          = {1929},
     keywords      = {Kaluza-Klein theory, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{EinsteinMayer1931b,
     author        = {Einstein, A. and Mayer, W.},
     title         = {Einheitliche Theorie von Gravitation und Elektrizit\"at},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {541--557},
     year          = {1931},
     keywords      = {Kaluza-Klein theory},
     number        = {25},
     ReferencedIn  = {lrr-2004-2}
}

@article{vanderWaerden1929,
     author        = {van der Waerden, B.L.},
     title         = {Spinoranalysis},
     journal       = {Nachr. Koenigl. Gesellsch. Wiss. Goettingen, Math.-Phys. Kl.},
     pages         = {100--106},
     year          = {1929},
     keywords      = {spinors},
     ReferencedIn  = {lrr-2004-2}
}

@book{vanderWaerden1932,
     author        = {van der Waerden, B.L.},
     title         = {Die gruppentheoretische Methode in der Quantenmechanik},
     publisher     = {Springer},
     address       = {Berlin},
     year          = {1932},
     keywords      = {group theory, quantum mechanics},
     ReferencedIn  = {lrr-2004-2}
}

@article{LaporteUhlenbeck1931,
     author        = {Laporte, O. and Uhlenbeck, G.E.},
     title         = {Application of Spinor Analysis to the Maxwell and Dirac Equations},
     journal       = {Phys. Rev.},
     volume        = {37},
     pages         = {1380--1397},
     year          = {1931},
     keywords      = {spinors},
     ReferencedIn  = {lrr-2004-2}
}

@article{Bortolotti1929,
     author        = {Bortolotti, E.},
     title         = {Stelle di congruenze e parallelisme assoluto: basi geometriche di una recente teoria di Einstein},
     journal       = {Rend. Lincei},
     volume        = {9},
     pages         = {530--538},
     year          = {1929},
     keywords      = {distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{Einstein1932,
     author        = {Einstein, A.},
     title         = {Der gegenw\"artige Stand der Relativit\"atstheorie},
     journal       = {Die Quelle},
     volume        = {82},
     pages         = {440--442},
     year          = {1932},
     keywords      = {Relativity},
     ReferencedIn  = {lrr-2004-2}
}

@article{Veblen1928,
     author        = {Veblen, O.},
     title         = {Projective tensors and connections},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {14},
     pages         = {154--166},
     year          = {1928},
     keywords      = {Projective geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Veblen1929a,
     author        = {Veblen, O.},
     title         = {Projective tensors and connections},
     journal       = {J. London Math. Soc.},
     volume        = {4},
     pages         = {140--160},
     year          = {1929},
     keywords      = {Projective geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Veblen1929b,
     author        = {Veblen, O.},
     title         = {A generalization of the quadratic differential form},
     journal       = {Quart. J. Math.},
     volume        = {1},
     pages         = {60},
     year          = {1929},
     ReferencedIn  = {lrr-2004-2}
}

@article{VeblenHoffmann1930,
     author        = {Veblen, O. and Hoffmann, B.},
     title         = {Projective relativity},
     journal       = {Phys. Rev.},
     volume        = {36},
     pages         = {810--822},
     year          = {1930},
     keywords      = {Distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Hoffmann1930,
     author        = {Hoffmann, B.},
     title         = {Projective Relativity and the Quantum Field},
     journal       = {Phys. Rev.},
     volume        = {37},
     pages         = {88--89},
     year          = {1930},
     keywords      = {Distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Whitehead1931,
     author        = {Whitehead, J.H.C.},
     title         = {The representation of projective spaces},
     journal       = {Ann. Math.},
     volume        = {32},
     pages         = {327--360},
     year          = {1931},
     keywords      = {Projective geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{SchoutenDantzig1931a,
     author        = {Schouten, J.A. and van Dantzig, D.},
     title         = {\"Uber eine vierdimensionale Deutung der neuesten Feldtheorie},
     journal       = {Proc. K. Akad. Wetensch.},
     volume        = {34},
     pages         = {1398--1407},
     year          = {1931},
     keywords      = {Projective geometry, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{EinsteinMayer1932a,
     author        = {Einstein, A. and Mayer, W.},
     title         = {Einheitliche Theorie von Gravitation und Elektrizit\"at. Zweite Abhandlung},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {130--137},
     year          = {1932},
     keywords      = {Kaluza-Klein theory},
     number        = {12},
     ReferencedIn  = {lrr-2004-2}
}

@article{Cartan1931b,
     author        = {Cartan, E.},
     title         = {Sur la th\'eorie des syst\`emes en involution et ses applications \`a la Relativit\'e},
     journal       = {Bull. Soc. Math. France},
     volume        = {59},
     pages         = {88--118},
     year          = {1931},
     keywords      = {partial differential equations, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{vanDantzig1932a,
     author        = {van Dantzig, D.},
     title         = {Zur allgemeinen projektiven Differentialgeometrie. I. Einordnung der Affingeometrie},
     journal       = {Proc. K. Akad. Wetensch.},
     volume        = {35},
     pages         = {524--534},
     year          = {1932},
     keywords      = {Projective geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{vanDantzig1932b,
     author        = {van Dantzig, D.},
     title         = {Zur allgemeinen projektiven Differentialgeometrie. II. $X_{n+1}$ mit eingliedriger Gruppe},
     journal       = {Proc. K. Akad. Wetensch.},
     volume        = {35},
     pages         = {525--542},
     year          = {1932},
     keywords      = {Projective geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{vanDantzig1932c,
     author        = {van Dantzig, D.},
     title         = {Theorie des projektiven Zusammenhangs n-dimensionaler R\"aume},
     journal       = {Math. Ann.},
     volume        = {106},
     pages         = {400--454},
     year          = {1932},
     keywords      = {Projective geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{SchoutenDantzig1932a,
     author        = {Schouten, J. A. and van Dantzig, D.},
     title         = {Zum Unifizierungsproblem der Physik; Skizze einer generellen Feldtheorie. (GF I)},
     journal       = {Proc. K. Akad. Wetensch.},
     volume        = {35},
     pages         = {642--655},
     year          = {1932},
     keywords      = {Projective geometry, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{SchoutenDantzig1932b,
     author        = {Schouten, J.A. and van Dantzig, D.},
     title         = {Zur generellen Feldtheorie; Diracsche Gleichung und Hamiltonsche Funktion. (GF II)},
     journal       = {Proc. K. Akad. Wetensch.},
     volume        = {35},
     pages         = {843--852},
     year          = {1932},
     keywords      = {Projective geometry, Dirac equation},
     ReferencedIn  = {lrr-2004-2}
}

@article{SchoutenDantzig1932c,
     author        = {Schouten, J.A. and van Dantzig, D.},
     title         = {Generelle Feldtheorie. (GF III)},
     journal       = {Z. Phys.},
     volume        = {78},
     pages         = {639--667},
     year          = {1932},
     keywords      = {Projective geometry, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{SchoutenDantzig1933a,
     author        = {Schouten, J.A. and van Dantzig, D.},
     title         = {On projective connections and their application to the general field theory. (GF VI)},
     journal       = {Ann. Math.},
     volume        = {34},
     pages         = {271--312},
     year          = {1933},
     keywords      = {Projective geometry, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{MichalBot1932,
     author        = {Michal, A.D. and Botsford, J.L.},
     title         = {Extension of the New Einstein Geometry},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {18},
     pages         = {554--558},
     year          = {1932},
     keywords      = {Projective geometry, Kaluza-Klein theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Michal1931,
     author        = {Michal, A.D.},
     title         = {Notes on scalar extensions of tensors and properties of local coordinates},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {17},
     pages         = {132--136},
     year          = {1931},
     keywords      = {Differential geometry},
     ReferencedIn  = {lrr-2004-2}
}

@article{Robertson1932,
     author        = {Robertson, H.P.},
     title         = {Groups of motions in space admitting absolute parallelism},
     journal       = {Ann. Math. (2)},
     volume        = {33},
     pages         = {496--520},
     year          = {1932},
     keywords      = {Groups of motion, distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{vanDantzig1926,
     author        = {van Dantzig, D.},
     title         = {Die Wiederholung des Michelson Versuch's und die Relativit\"atstheorie},
     journal       = {Math. Ann.},
     volume        = {96},
     pages         = {261--228},
     year          = {1926},
     keywords      = {Special Relativity},
     ReferencedIn  = {lrr-2004-2}
}

@article{SchoutenDantzig1930,
     author        = {Schouten, J.A. and van Dantzig, D.},
     title         = {\"Uber unit\"are Geometrie},
     journal       = {Math. Ann.},
     volume        = {103},
     pages         = {319--346},
     year          = {1930},
     keywords      = {Hermitian geometry, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@inbook{Cartan1934,
     author        = {Cartan, E.},
     title         = {La th\'eorie unitaire d`Einstein-Mayer},
     booktitle     = {Oeuvres Compl\`etes},
     pages         = {1863--1875},
     keywords      = {Kaluza-Klein, projective geometry},
     volume        = {III/2},
     note          = {manuscrit datant de 1934 environ},
     ReferencedIn  = {lrr-2004-2}
}

@article{Cartan1922a,
     author        = {Cartan, E.},
     title         = {Sur les vari\'et\'es \`a connexion affine courbure de Riemann et les espaces \`a torsion},
     journal       = {C. R. Acad. Sci.},
     volume        = {174},
     pages         = {593--595},
     year          = {1922},
     keywords      = {torsion, distant parallelism},
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}

@article{Cartan1922b,
     author        = {Cartan, E.},
     title         = {Sur les espaces g\'en\'eralis\'es et la th\'eorie de la relativit\'e},
     journal       = {C. R. Acad. Sci.},
     volume        = {174},
     pages         = {734--737},
     year          = {1922},
     keywords      = {affine geometry, torsion},
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}

@book{Debever1976,
     editor        = {Debever, R.},
     title         = {Elie Cartan-Albert Einstein: Lettres sur le parallelisme absolu 1929-1932},
     publisher     = {Academie Royale de Belgique},
     address       = {Bruxelles},
     year          = {1979},
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}

@article{Eisenhart1926,
     author        = {Eisenhart, L.P.},
     title         = {Einstein's recent theory of gravitation and electricity},
     journal       = {Proc. Nat. Acad. Sci. U.S.A.},
     volume        = {12},
     pages         = {125--129},
     year          = {1926},
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}

@article{Einstein1921a,
     author        = {Einstein, A.},
     title         = {Geometrie und Erfahrung},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {123--130},
     year          = {1921},
     number        = {5},
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}

@article{Lanczos1931,
     author        = {Lanczos, C.},
     title         = {Die neue Feldtheorie Einsteins},
     journal       = {Ergeb. Exakten Naturwiss.},
     volume        = {10},
     pages         = {97--132},
     year          = {1931},
     keywords      = {Distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Pauli1931,
     author        = {Pauli, W.},
     title         = {[Besprechung von] Band 10 der Ergebnisse der exakten Naturwissenschaften},
     journal       = {Ergeb. Exakten Naturwiss.},
     volume        = {11},
     pages         = {186--187},
     year          = {1931},
     keywords      = {Distant parallelism, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Lanczos1932,
     author        = {Lanczos, C.},
     title         = {Elektromagnetismus als nat\"urliche Eigenschaft der Riemannschen Geometrie},
     journal       = {Z. Phys.},
     volume        = {73},
     pages         = {147--168},
     year          = {1931},
     keywords      = {Riemannian geometry, quadratic Lagrangians, unified field theory},
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}

@article{Wigner1929,
     author        = {Wigner, E.},
     title         = {Eine Bemerkung zu Einsteins neuer Formulierung des allgemeinen Relativit\"atsprinzips},
     journal       = {Z. Phys.},
     volume        = {53},
     pages         = {592--596},
     year          = {1929},
     keywords      = {Dirac equation, distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{Tetrode1928a,
     author        = {Tetrode, H.},
     title         = {Allgemein-relativistische Quantentheorie des Elektrons},
     journal       = {Z. Phys.},
     volume        = {49},
     pages         = {858--864},
     year          = {1928},
     keywords      = {Dirac equation, general relativity},
     ReferencedIn  = {lrr-2004-2}
}

@article{Tetrode1928b,
     author        = {Tetrode, H.},
     title         = {Allgemein-relativistische Quantentheorie des Elektrons},
     journal       = {Z. Phys.},
     volume        = {50},
     pages         = {336--346},
     year          = {1928},
     keywords      = {Dirac equation, general relativity},
     ReferencedIn  = {lrr-2004-2}
}

@article{Whittaker1928,
     author        = {Whittaker, J.M.},
     title         = {On the principle of least action in wave mechanics},
     journal       = {Proc. R. Soc. London},
     volume        = {A 121},
     pages         = {543--557},
     year          = {1928},
     keywords      = {unified field theory, wave equation},
     ReferencedIn  = {lrr-2004-2}
}

@book{Maeterlinck1930,
     author        = {Maeterlick, M.},
     title         = {Geheimnisse des Weltalls},
     publisher     = {Deutsche Verlagsanstalt},
     address       = {Berlin und Leipzig},
     year          = {1930},
     keywords      = {Unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{deDonder1928,
     author        = {de Donder, T.E.},
     title         = {G\'en\'eralisation relativiste de la nouvelle th\'eorie d`Einstein},
     journal       = {C. R. Acad. Sci.},
     volume        = {187},
     pages         = {817--819},
     year          = {1928},
     keywords      = {Distant parallelism},
     ReferencedIn  = {lrr-2004-2}
}

@article{Madelung1929,
     author        = {Madelung, E.},
     title         = {Eine \"Ubertragung der Diracschen Theorie des Elektrons in gewohnte Formen},
     journal       = {Z. Phys.},
     volume        = {54},
     pages         = {303--306},
     year          = {1929},
     keywords      = {Dirac equation, Maxwell equations},
     ReferencedIn  = {lrr-2004-2}
}

@article{Temple1929,
     author        = {Temple, G.},
     title         = {The Tensorial Form of Dirac's Wave Equation},
     journal       = {Proc. R. Soc. London},
     volume        = {A 122},
     pages         = {352--357},
     year          = {1929},
     keywords      = {Dirac equation},
     ReferencedIn  = {lrr-2004-2}
}

@article{Lanczos1929a,
     author        = {Lanczos, C.},
     title         = {Die tensoranalytischen Beziehungen der Diracschen Gleichung},
     journal       = {Z. Phys.},
     volume        = {57},
     pages         = {447--473},
     year          = {1929},
     keywords      = {Dirac equation, quaternions},
     ReferencedIn  = {lrr-2004-2}
}

@article{Lanczos1929b,
     author        = {Lanczos, C.},
     title         = {Zur kovarianten Formulierung der Diracschen Gleichung},
     journal       = {Z. Phys.},
     volume        = {57},
     pages         = {474--483},
     year          = {1929},
     keywords      = {Dirac equation, Maxwell equation},
     ReferencedIn  = {lrr-2004-2}
}

@article{Lanczos1929c,
     author        = {Lanczos, C.},
     title         = {Die Erhaltungss\"atze in der feldm\"assigen Darstellung der Diracschen Theorie},
     journal       = {Z. Phys.},
     volume        = {57},
     pages         = {484--493},
     year          = {1929},
     keywords      = {Dirac equation, unified field theory},
     ReferencedIn  = {lrr-2004-2}
}

@article{Rumer1930,
     author        = {Rumer, G.},
     title         = {Zur Wellentheorie des Lichtquants},
     journal       = {Z. Phys.},
     volume        = {65},
     pages         = {244--252},
     year          = {1930},
     keywords      = {Dirac equation, Maxwell equation},
     ReferencedIn  = {lrr-2004-2}
}

@article{Darwin1928,
     author        = {Darwin, C.G.},
     title         = {The wave equations of the electron},
     journal       = {Proc. R. Soc. London, Ser. A},
     volume        = {118},
     pages         = {654--680},
     year          = {1928},
     keywords      = {Dirac equation},
     ReferencedIn  = {lrr-2004-2}
}

@article{Mie1928,
     author        = {Mie, G.},
     title         = {Untersuchungen zum Problem der Quantenelektrik},
     journal       = {Ann. Phys.},
     volume        = {85},
     pages         = {711--729},
     year          = {1928},
     keywords      = {Wave mechanics},
     ReferencedIn  = {lrr-2004-2}
}

@article{HeisenbergPauli1929,
     author        = {Heisenberg, W. and Pauli, W.},
     title         = {Zur Quantendynamik der Wellenfelder},
     journal       = {Z. Phys.},
     volume        = {56},
     pages         = {1--61},
     year          = {1929},
     keywords      = {field quantisation},
     ReferencedIn  = {lrr-2004-2}
}

@article{Reichenbaecher1929a,
     author        = {Reichenb\"acher, E.},
     title         = {Eine wellenmechanische Zweikomponententheorie},
     journal       = {Z. Phys.},
     volume        = {58},
     pages         = {402--424},
     year          = {1929},
     keywords      = {general relativistic Dirac equation},
     ReferencedIn  = {lrr-2004-2}
}

@article{Reichenbaecher1930a,
     author        = {Reichenb\"acher, E.},
     title         = {Eine wellenmechanische Zweikomponententheorie.II},
     journal       = {Z. Phys.},
     volume        = {61},
     pages         = {490--510},
     year          = {1930},
     keywords      = {general relativistic Dirac equation},
     ReferencedIn  = {lrr-2004-2}
}

@article{Bargmann1932,
     author        = {Bargmann, V.},
     title         = {Bemerkungen zur allgemein-relativistischen Fassung der Quantentheorie},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {346--354},
     year          = {1932},
     keywords      = {general relativistic Dirac equation},
     number        = {XXIV},
     ReferencedIn  = {lrr-2004-2}
}

@article{LeviCivita1933,
     author        = {Levi-Civita, T.},
     title         = {Diracsche und Schr\"odingersche Gleichungen},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {240--250},
     year          = {1933},
     keywords      = {general relativistic Dirac equation},
     number        = {V},
     ReferencedIn  = {lrr-2004-2}
}

@article{Schouten1931,
     author        = {Schouten, J.A.},
     title         = {Dirac equation in general relativity. 1. Four dimensional theory},
     journal       = {J. Math. Phys. (MIT)},
     volume        = {10},
     pages         = {239--283},
     year          = {1930--1931},
     keywords      = {general relativistic Dirac equation},
     ReferencedIn  = {lrr-2004-2}
}

@article{Schouten1931b,
     author        = {Schouten, J.A.},
     title         = {Dirac Equations in General Relativity. 2. Five Dimensional Theory},
     journal       = {J. Math. Phys. (MIT)},
     volume        = {10},
     pages         = {272--283},
     year          = {1930--1931},
     keywords      = {general relativistic Dirac equation},
     ReferencedIn  = {lrr-2004-2}
}

@article{Schouten1930,
     author        = {Schouten, J.A.},
     title         = {Die Darstellung der Lorentzgruppe in der komplexen $E_2$ abgeleitet aus den Diracschen Zahlen},
     journal       = {Proc. K. Akad. Wetensch.},
     volume        = {38},
     pages         = {189--197},
     year          = {1930},
     keywords      = {Lorentz group},
     ReferencedIn  = {lrr-2004-2}
}

@article{InfeldWaerden1933,
     author        = {Infeld, L. and van der Waerden, B.L.},
     title         = {Die Wellengleichung des Elektrons in der allgemeinen Relativit\"atstheorie},
     journal       = {Sitzungsber. Preuss. Akad. Wiss.},
     pages         = {380--401},
     year          = {1933},
     keywords      = {general relativistic Dirac equation},
     number        = {IX},
     ReferencedIn  = {lrr-2004-2}
}

@article{GonsethJuvet1927a,
     author        = {Gonseth, F. and Juvet, G.},
     title         = {Sur les \'equations de l'\'electromagn\'etisme},
     journal       = {C. R. Acad. Sci.},
     volume        = {185},
     pages         = {341--343},
     year          = {1927},
     keywords      = {Kaluza-Klein, wave mechanics},
     note          = {eratum p. 483},
     ReferencedIn  = {lrr-2004-2}
}

@article{GonsethJuvet1927b,
     author        = {Gonseth, F. and Juvet, G.},
     title         = {Sur la m\'etrique de l'espace \`a cinq dimensions de l'\'electromagn\'etisme at de la gravitation},
     journal       = {C. R. Acad. Sci.},
     volume        = {185},
     pages         = {412--413},
     year          = {1927},
     keywords      = {Kaluza-Klein, wave mechanics},
     ReferencedIn  = {lrr-2004-2}
}

@article{GonsethJuvet1927c,
     author        = {Gonseth, F. and Juvet, G.},
     title         = {Sur l'\'equation de M. Schr\"odinger},
     journal       = {C. R. Acad. Sci.},
     volume        = {185},
     pages         = {448--450},
     year          = {1927},
     keywords      = {Kaluza-Klein, wave mechanics},
     note          = {eratum p. 624},
     ReferencedIn  = {lrr-2004-2}
}

@article{GonsethJuvet1927d,
     aut