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Demonstratio Mathematica > 2020 > Vol. 53, nr 1 > 27--37
Journal of Applied Analysis > 2017 > Vol. 23, nr 1 > 25--32
Demonstratio Mathematica > 2010 > Vol. 43, nr 1 > 55-79
Demonstratio Mathematica > 2008 > Vol. 41, nr 3 > 551-559
Demonstratio Mathematica > 2007 > Vol. 40, nr 3 > 567-574
Journal of Mathematics and Applications > 2006 > Vol. 28 > 85-91