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Open Mathematics > 2015 > 13 > 1
Open Mathematics > 2013 > 11 > 3 > 574-593
Commentationes Mathematicae > 2009 > 49 > 2
Annales Polonici Mathematici > 1996-1997 > 65 > 2 > 163-170
Open Mathematics > 2015 > 13 > 1
Open Mathematics > 2013 > 11 > 3 > 574-593
Commentationes Mathematicae > 2009 > 49 > 2
Annales Polonici Mathematici > 1996-1997 > 65 > 2 > 163-170