ASTROPHYSICAL EVIDENCE FOR BLACK HOLE EVENT HORIZONS
Kristen MENOU, Eliot QUATAERT and Ramesh NARAYAN

http://www.citebase.org/cgi-bin/citations?id=oai:arXiv.org:astro-ph/9712015




The Confrontation between General Relativity and Experiment
Clifford M. Will 
Update available
 http://www.livingreviews.org/lrr-2006-3