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Acta Mathematica Scientia > 2014 > 34 > 2 > 313-330
Acta Mathematica Scientia > 2008 > 28 > 4 > 933-948
Journal of Algebra > 2007 > 307 > 2 > 804-828
Acta Mathematica Scientia > 2014 > 34 > 2 > 313-330
Acta Mathematica Scientia > 2008 > 28 > 4 > 933-948
Journal of Algebra > 2007 > 307 > 2 > 804-828