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Discussiones Mathematicae - General Algebra and Applications > 2013 > 33 > 2 > 233-247
Commentationes Mathematicae > 2011 > 51 > 1
Discussiones Mathematicae - General Algebra and Applications > 2013 > 33 > 2 > 233-247
Commentationes Mathematicae > 2011 > 51 > 1