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Annales Mathematicae Silesianae > 2017 > 31 > 1 > 141-153
Open Mathematics > 2017 > 15 > 1 > 365-373
Open Mathematics > 2016 > 14 > 1 > 338-346
Open Mathematics > 2013 > 11 > 5 > 900-909
Discussiones Mathematicae - General Algebra and Applications > 2013 > 33 > 2 > 233-247
Open Mathematics > 2011 > 9 > 1 > 50-56
Studia Mathematica > 1994 > 109 > 1 > 67-72