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Open Mathematics > 2016 > 14 > 1 > 81-88
Open Mathematics > 2016 > 14 > 1 > 1007-1013
Discussiones Mathematicae - General Algebra and Applications > 2014 > 34 > 1 > 85-93
Open Mathematics > 2016 > 14 > 1 > 81-88
Open Mathematics > 2016 > 14 > 1 > 1007-1013
Discussiones Mathematicae - General Algebra and Applications > 2014 > 34 > 1 > 85-93