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Mathematical Methods in the Applied Sciences > 43 > 7 > 4871 - 4882
Mathematical Methods in the Applied Sciences > 41 > 17 > 7182 - 7194
Nonlinear Dynamics > 2017 > 90 > 4 > 2371-2386
Advances in Difference Equations > 2017 > 2017 > 1 > 1-14