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Mathematical Methods in the Applied Sciences > 41 > 12 > 4763 - 4775
Advances in Difference Equations > 2016 > 2016 > 1 > 1-14
Advances in Difference Equations > 2014 > 2014 > 1 > 1-11
Advances in Difference Equations > 2014 > 2014 > 1 > 1-15
Fasciculi Mathematici > 2010 > Nr 43 > 13-18
Applied Mathematics and Computation > 2004 > 156 > 2 > 587-590
Applied Mathematics and Computation > 2004 > 150 > 1 > 21-24