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Boundary Value Problems > 2016 > 2016 > 1 > 1-17
Journal of Fixed Point Theory and Applications > 2015 > 17 > 4 > 641-657
Boundary Value Problems > 2016 > 2016 > 1 > 1-17
Journal of Fixed Point Theory and Applications > 2015 > 17 > 4 > 641-657