By Puninskaya Vera   in Communications in Algebra

ISSN:0092-7872|30|3|1227-1240

Taylor & Francis Ltd‎(2002)‎

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By L'innocente Sonia   Puninskaya Vera   Toffalori Carlo   in Communications in Algebra

ISSN:0092-7872|36|7|2750-2763

Taylor & Francis Ltd‎(2008)‎

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