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Discussiones Mathematicae - General Algebra and Applications > 2004 > 24 > 1 > 63-74
Discussiones Mathematicae - General Algebra and Applications > 2003 > 23 > 2 > 115-123
Discussiones Mathematicae - General Algebra and Applications > 2004 > 24 > 1 > 63-74
Discussiones Mathematicae - General Algebra and Applications > 2003 > 23 > 2 > 115-123