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Open Mathematics > 2017 > 15 > 1 > 1606-1617
Open Mathematics > 2017 > 15 > 1 > 1568-1577
Topological Algebra and its Applications > 2016 > 4 > 1 > 1-8
Commentationes Mathematicae > 2014 > 54 > 2
Commentationes Mathematicae > 2009 > 49 > 1
Commentationes Mathematicae > 2009 > 49 > 1
International Journal of Applied Mathematics and Computer Science > 2008 > 18 > 3 > 369-375
Commentationes Mathematicae > 2008 > 48 > 1
Open Mathematics > 2004 > 2 > 3 > 448-477
Studia Mathematica > 2000 > 142 > 3 > 253-267
Studia Mathematica > 1997 > 125 > 2 > 161-174
Applicationes Mathematicae > 1993-1995 > 22 > 1 > 91-102