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Open Mathematics > 2016 > 14 > 1 > 324-337
Discussiones Mathematicae - General Algebra and Applications > 2013 > 33 > 2 > 233-247
Open Mathematics > 2016 > 14 > 1 > 324-337
Discussiones Mathematicae - General Algebra and Applications > 2013 > 33 > 2 > 233-247