Published in "Extragalactic Background Radiation", Space Telescope Science Institute Symposium Series 7, 1995, eds. D. Calzetti, M. Livio and P. Madau
Abstract. We review the observational data of the extragalactic gamma-ray background obtained before the launch of the Compton Gamma Ray Observatory and the theoretical interpretations. We also summarize the latest AGN observations by Compton which pertain to the origin of the extragalactic gamma-ray background and their implications.
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