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Acta Mathematica Scientia > 2008 > 28 > 4 > 933-948
Algebra Colloquium > 2003 > 10 > 1 > 53-62
Algebra Colloquium > 2003 > 10 > 1 > 53-62
Acta Mathematica Scientia > 2008 > 28 > 4 > 933-948
Algebra Colloquium > 2003 > 10 > 1 > 53-62
Algebra Colloquium > 2003 > 10 > 1 > 53-62