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Commentationes Mathematicae > 2014 > 54 > 2
Open Mathematics > 2011 > 9 > 3 > 640-656
Commentationes Mathematicae > 2011 > 51 > 1
Open Mathematics > 2009 > 7 > 2 > 335-347
Fundamenta Mathematicae > 1998 > 156 > 1 > 67-72
Studia Mathematica > 1991 > 100 > 2 > 95-108