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Demonstratio Mathematica > 2015 > Vol. 48, nr 3 > 413--423
Journal of Applied Analysis > 2002 > Vol. 8, nr 1 > 33-48
Demonstratio Mathematica > 2015 > Vol. 48, nr 3 > 413--423
Journal of Applied Analysis > 2002 > Vol. 8, nr 1 > 33-48