By Cohen Arjeh M.   Taylor D. E.   in American Mathematical Monthly

ISSN:1930-0972|114|7|633-639

Mathematical Association of America‎(2007)‎

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By Cohen Arjeh M.   Gijsbers Dié A. H.   Wales David B.   in Communications in Algebra

ISSN:0092-7872|42|1|22-55

Taylor & Francis Ltd‎(2014)‎

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