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Observational Evidence for Black Holes in the Universe 124 Antibiotics alone have not beenA conference on `Observational Evidence for Black Holes in the Universe' was held in Calcutta during January 10 17, 1998. This was the first time that experts had gathered to debate and discuss topics such as: Should black holes exist? If so, how to detect them? Have we found them? This book is the essence of this gathering. Black holes are enigmatic objects since it is impossible to locate them through direct observations. State of the art