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Annales UMCS, Mathematica > 2014 > 68 > 2
Discussiones Mathematicae - General Algebra and Applications > 2014 > 34 > 2 > 191-201
Annales UMCS, Mathematica > 2014 > 68 > 2
Discussiones Mathematicae - General Algebra and Applications > 2014 > 34 > 2 > 191-201