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Discussiones Mathematicae - General Algebra and Applications > 2013 > 33 > 2 > 233-247
Annales Polonici Mathematici > 1993 > 58 > 2 > 111-122
Discussiones Mathematicae - General Algebra and Applications > 2013 > 33 > 2 > 233-247
Annales Polonici Mathematici > 1993 > 58 > 2 > 111-122