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Archiv der Mathematik > 2007 > 89 > 2 > 109-113
Journal of Algebra > 2003 > 266 > 2 > 382-392
Journal of Algebra > 2001 > 242 > 1 > 20-30
Archiv der Mathematik > 2007 > 89 > 2 > 109-113
Journal of Algebra > 2003 > 266 > 2 > 382-392
Journal of Algebra > 2001 > 242 > 1 > 20-30