Extensions of Abelian Categories and the
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N. Marmaridis; A. Papistas
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Article
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1995
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Elsevier Science
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English
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It is a pleasure to thank the referec for his valuable suggestions which resulted in an improvement of the manuscript. The first author also thanks Professor E. L. Green for valuable discussions concerning the package GRB, on May 1994 at SFB 343, University Bielefeld; and Professor C. M. Ringel for