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Demonstratio Mathematica > 2021 > Vol. 54, nr 1 > 335--358
Commentationes Mathematicae > 2020 > Vol. 60, No. 1/2 > 37--63
Journal of Mathematical Sciences > 2019 > 241 > 4 > 423-429
Fasciculi Mathematici > 2019 > nr 62 > 93--102
Demonstratio Mathematica > 2018 > Vol. 51, nr 1 > 304--308
Journal of Mathematical Sciences > 2018 > 230 > 6 > 950-960
Journal of Mathematical Sciences > 2018 > 230 > 6 > 823-906
Journal of Mathematical Sciences > 2018 > 230 > 5 > 782-785
Technical Transactions > 2017 > Vol. 1(114) > 147--154
Demonstratio Mathematica > 2014 > Vol. 47, nr 4 > 784--790
Demonstratio Mathematica > 2013 > Vol. 46, nr 2 > 299--314
Demonstratio Mathematica > 2013 > Vol. 46, nr 3 > 559--569
Demonstratio Mathematica > 2012 > Vol. 45, nr 3 > 561-573
Probability and Mathematical Statistics > 2011 > Vol. 31, Fasc. 2 > 227--238
Demonstratio Mathematica > 2011 > Vol. 44, nr 2 > 317-333
Commentationes Mathematicae > 2010 > Vol. 50, [Z] 2 > 109-120
Fasciculi Mathematici > 2009 > Nr 42 > 85-89