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Advances in Difference Equations > 2013 > 2013 > 1 > 1-10
Journal of Inequalities and Applications > 2013 > 2013 > 1 > 1-15
Advances in Difference Equations > 2013 > 2013 > 1 > 1-10
Journal of Inequalities and Applications > 2013 > 2013 > 1 > 1-15