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Demonstratio Mathematica > 2021 > Vol. 54, nr 1 > 245--258
Journal of Applied Analysis > 2018 > Vol. 24, nr 1 > 55--69
Demonstratio Mathematica > 2021 > Vol. 54, nr 1 > 245--258
Journal of Applied Analysis > 2018 > Vol. 24, nr 1 > 55--69