By Naghipour R.   Sedghi M.   in Communications in Algebra

ISSN:0092-7872|34|2|763-777

Taylor & Francis Ltd‎(2006)‎

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By Naghipour R.   Sedghi M.   in Acta Mathematica Hungarica

ISSN:0236-5294|110|1-2|1-12

Springer Publishing Company ‎(2006)‎

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By Naghipour R.   Sedghi M.   in Archiv der Mathematik

ISSN:0003-889X|87|4|303-308

Springer Publishing Company ‎(2006)‎

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By Divaani-Aazar K.   Naghipour R.   Tousi M.   in Communications in Algebra

ISSN:0092-7872|30|8|3687-3702

Taylor & Francis Ltd‎(2002)‎

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