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Fasciculi Mathematici > 2023 > nr 66 > 91--106
Journal of Applied Analysis > 2020 > Vol. 26, nr 1 > 91--95
Demonstratio Mathematica > 2020 > Vol. 53, nr 1 > 27--37
Fundamenta Informaticae > 2017 > Vol. 151, nr 1/4 > 49--62
Journal of Applied Analysis > 2017 > Vol. 23, nr 1 > 25--32
Journal of Mathematics and Applications > 2013 > Vol. 36 > 63--69
Journal of Applied Analysis > 2010 > Vol. 16, nr 2 > 305-313
Demonstratio Mathematica > 2010 > Vol. 43, nr 1 > 55-79
Demonstratio Mathematica > 2008 > Vol. 41, nr 3 > 551-559
Demonstratio Mathematica > 2008 > Vol. 41, nr 4 > 791-803
Demonstratio Mathematica > 2008 > Vol. 41, nr 2 > 381-388
Journal of Mathematics and Applications > 2008 > Vol. 30 > 103-112
Journal of Mathematics and Applications > 2008 > Vol. 30 > 83-90
Journal of Mathematics and Applications > 2008 > Vol. 30 > 91-102
Demonstratio Mathematica > 2007 > Vol. 40, nr 3 > 567-574
Journal of Mathematics and Applications > 2006 > Vol. 28 > 85-91
Demonstratio Mathematica > 2005 > Vol. 38, nr 1 > 47--57
Demonstratio Mathematica > 2005 > Vol. 38, nr 3 > 567--578
Demonstratio Mathematica > 2005 > Vol. 38, nr 2 > 303--311