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     author        = {Penrose, R.},
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     publisher     = {Ellis Horwood Ltd.},
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@article{tod83a,
     author        = {Tod, K.P.},
     title         = {Some examples of Penrose's quasi-local mass construction},
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     volume        = {388},
     pages         = {457--477},
     year          = {1983},
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@article{tod83b,
     author        = {Tod, K.P.},
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@article{shaw83a,
     author        = {Shaw, W.T.},
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@article{tod84a,
     author        = {Tod, K.P.},
     title         = {Three-surface twistors and conformal embedding},
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     volume        = {16},
     pages         = {435--443},
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@article{tod85a,
     author        = {Tod, K.P.},
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@article{shaw83b,
     author        = {Shaw, W.T.},
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     year          = {1983},
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@article{tipler85,
     author        = {Tipler, F.J.},
     title         = {Penrose's quasi-local mass in the Kantowski-Sachs closed universe},
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     pages         = {L99--L103},
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@article{penrose84c,
     author        = {Penrose, R.},
     title         = {New improved quasi-local mass and the Schwarzschild solutions},
     journal       = {Twistor Newsletter},
     pages         = {7--11},
     year          = {1984},
     keywords      = {quasi-local mass, twistors, mass functions},
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@article{tod84b,
     author        = {Tod, K.P.},
     title         = {More on quasi-local mass},
     journal       = {Twistor Newsletter},
     pages         = {3--6},
     year          = {1984},
     keywords      = {quasi-local mass, twistors, mass functions},
     number        = {18},
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@article{penrose85,
     author        = {Penrose, R.},
     title         = {A suggested further modification to the quasi-local formula},
     journal       = {Twistor Newsletter},
     pages         = {7},
     year          = {1985},
     keywords      = {quasi-local mass, twistors, mass functions},
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@article{kelly85,
     author        = {Kelly, R.M.},
     title         = {Asymptotically anti de Sitter space-times},
     journal       = {Twistor Newsletter},
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     year          = {1985},
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@inproceedings{jeffryes84a,
     author        = {Jeffryes, B.P.},
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     year          = {1984},
     editor        = {Flaherty, F.J.},
     pages         = {177--184},
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@article{jeffryes87,
     author        = {Jeffryes, B.P.},
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     journal       = {Proc. R. Soc. London, Ser. A},
     volume        = {411},
     pages         = {59--83},
     year          = {1987},
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@inproceedings{shaw84b,
     author        = {Shaw, W.T.},
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     booktitle     = {Asymptotic Behavior of Mass and Spacetime Geometry. Proceedings of the conference, held at Oregon State Univ., Corvallis, Oregon, USA, October 17-21, 1983},
     year          = {1984},
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@article{jeffryes86a,
     author        = {Jeffryes, B.P.},
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     volume        = {3},
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@article{jeffryes86b,
     author        = {Jeffryes, B.P.},
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@article{shaw86b,
     author        = {Shaw, W.T.},
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     journal       = {Class. Quantum Grav.},
     volume        = {3},
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@article{woodhouse87,
     author        = {Woodhouse, N.M.J.},
     title         = {Ambiguities in the definition of quasi-local mass},
     journal       = {Class. Quantum Grav.},
     volume        = {4},
     pages         = {L121--L123},
     year          = {1987},
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@article{tod87,
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     title         = {Quasilocal energy in general relativity},
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     address       = {Providence, RI},
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@article{lau93,
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@article{lau95,
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@article{lau96,
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@article{BLY97,
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@unpublished{lau00,
     author        = {Lau, S.R.},
     title         = {Lectures given at the `International Workshop on Geometric Physics'},
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@misc{lau03,
     keywords      = {quasi-local energy-momentum, canonical methods, mass functions},
     author        = {Lau, S.R.},
     howpublished  = {private communication},
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@article{BLP03,
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     title         = {Center of mass integral in canonical general relativity},
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     volume        = {307},
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@online{saharian03,
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@article{liu:yau03,
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