To be published in "General Relativity and Gravitation: A Centennial Perspective", Editors: A. Ashtekar, B. Berger, J. Isenberg and M.A.H. MacCallum, Cambridge University Press.

For a PDF version of the article, click here.


P. Mészáros 1, M.J. Rees 2

1 Dpt. of Astronomy and Astrophysics; Dpt. of Physics; Ctr. for Particle and Gravitational Astrophysics; Inst. for Gravitation and the Cosmos; Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA
2 Institute of Astronomy, Cambridge University, Madingley Road, Cambridge CB30HA, U.K.

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