By Karamzadeh O. A. S.   in The College Mathematics Journal

ISSN:1931-1346|45|3|217-218

Mathematical Association of America‎(2014)‎

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By Hashemi J.   Karamzadeh O. A. S.   Shirali N.   in Communications in Algebra

ISSN:0092-7872|37|2|650-662

Taylor & Francis Ltd‎(2009)‎

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