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Advances in Difference Equations > 2019 > 2019 > 1 > 1-15
Open Mathematics > 2017 > 15 > 1 > 616-627
Boundary Value Problems > 2016 > 2016 > 1 > 1-16
Advances in Difference Equations > 2019 > 2019 > 1 > 1-15
Open Mathematics > 2017 > 15 > 1 > 616-627
Boundary Value Problems > 2016 > 2016 > 1 > 1-16