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Open Mathematics > 2017 > 15 > 1 > 331-339
Commentationes Mathematicae > 2017 > 57 > 1
Annales UMCS, Mathematica > 2013 > 67 > 2 > 53-58
Open Mathematics > 2013 > 11 > 9 > 1698-1710
Topological Algebra and its Applications > 2013 > 1 > 9-21
Commentationes Mathematicae > 2012 > 52 > 2
Open Mathematics > 2010 > 8 > 4 > 807-815
Commentationes Mathematicae > 2006 > 46 > 1
Studia Mathematica > 1996 > 120 > 1 > 61-74
Studia Mathematica > 1994 > 109 > 2 > 171-182
Annales Polonici Mathematici > 1994-1995 > 60 > 2 > 173-197
Fundamenta Mathematicae > 1993 > 143 > 1 > 75-85
Annales Polonici Mathematici > 1991-1992 > 56 > 3 > 227-232