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Demonstratio Mathematica > 2022 > Vol. 55, nr 1 > 737--751
Demonstratio Mathematica > 2022 > Vol. 55, nr 1 > 553--573
Demonstratio Mathematica > 2021 > Vol. 54, nr 1 > 558--575
Demonstratio Mathematica > 2021 > Vol. 54, nr 1 > 245--258
Demonstratio Mathematica > 2019 > Vol. 52, nr 1 > 204--212
Journal of Applied Analysis > 2018 > Vol. 24, nr 1 > 55--69
Environmental Systems Research > 2014 > 3 > 1 > 1-20
Advances in Difference Equations > 2013 > 2013 > 1 > 1-24
Boundary Value Problems > 2013 > 2013 > 1 > 1-11
Boundary Value Problems > 2013 > 2013 > 1 > 1-6
Advances in Difference Equations > 2013 > 2013 > 1 > 1-22
Demonstratio Mathematica > 2012 > Vol. 45, nr 1 > 81-93
Fasciculi Mathematici > 2008 > Nr 39 > 47-61