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Mathematische Nachrichten > 296 > 7 > 2809 - 2837
Journal of Inequalities and Applications > 2019 > 2019 > 1 > 1-30
Mathematical Methods in the Applied Sciences > 41 > 9 > 3246 - 3269
Journal of Mathematical Analysis and Applications > 2017 > 452 > 1 > 401-428
Journal of Mathematical Analysis and Applications > 2015 > 429 > 1 > 602-621
Nonlinear Analysis > 2015 > 113 > Complete > 115-136
Advances in Difference Equations > 2015 > 2015 > 1 > 1-18
Advances in Difference Equations > 2013 > 2013 > 1 > 1-15
Advances in Difference Equations > 2012 > 2012 > 1 > 1-14
Applied Mathematics Letters > 2010 > 23 > 9 > 971-974
Mathematica Slovaca > 2010 > 60 > 2 > 237-256