By Letzter Edward S.   in Communications in Algebra

ISSN:0092-7872|35|7|2183-2190

Taylor & Francis Ltd‎(2007)‎

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By Letzter Edward S.   in American Mathematical Monthly

ISSN:1930-0972|122|1|70-74

Mathematical Association of America‎(2015)‎

Access to resources Favorite 19.013542