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Discussiones Mathematicae - General Algebra and Applications > 2014 > 34 > 2 > 143-153
Discussiones Mathematicae - General Algebra and Applications > 2008 > 28 > 2 > 193-208
Discussiones Mathematicae - General Algebra and Applications > 2014 > 34 > 2 > 143-153
Discussiones Mathematicae - General Algebra and Applications > 2008 > 28 > 2 > 193-208