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Demonstratio Mathematica > 2016 > Vol. 49, nr 3 > 271--281
Demonstratio Mathematica > 2015 > Vol. 48, nr 4 > 554--561
Commentationes Mathematicae > 2011 > Vol. 51, [Z] 2 > 121-124
Commentationes Mathematicae > 2011 > 51 > 2
Demonstratio Mathematica > 2016 > Vol. 49, nr 3 > 271--281
Demonstratio Mathematica > 2015 > Vol. 48, nr 4 > 554--561
Commentationes Mathematicae > 2011 > Vol. 51, [Z] 2 > 121-124
Commentationes Mathematicae > 2011 > 51 > 2