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Mathematical Methods in the Applied Sciences > 44 > 17 > 13060 - 13068
Advances in Difference Equations > 2019 > 2019 > 1 > 1-15
Boundary Value Problems > 2019 > 2019 > 1 > 1-21
Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales.... > 2019 > 113 > 2 > 1041-1057
Afrika Matematika > 2015 > 26 > 7-8 > 1349-1357