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Demonstratio Mathematica > 2021 > Vol. 54, nr 1 > 335--358
Journal of Mathematics and Applications > 2021 > Vol. 44 > 71--73
Commentationes Mathematicae > 2020 > Vol. 60, No. 1/2 > 37--63
Fasciculi Mathematici > 2019 > nr 62 > 93--102
Demonstratio Mathematica > 2018 > Vol. 51, nr 1 > 304--308
Journal of Mathematics and Applications > 2018 > Vol. 41 > 39--51
Technical Transactions > 2017 > Vol. 1(114) > 147--154
Journal of Mathematics and Applications > 2017 > Vol. 40 > 21--36
Journal of Mathematics and Applications > 2017 > Vol. 40 > 85--96
International Journal of Applied Mathematics and Computer Science > 2016 > Vol. 26, no. 2 > 263--275
Journal of Mathematics and Applications > 2016 > Vol. 39 > 5--22
Journal of Mathematics and Applications > 2015 > Vol. 38 > 71--76
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