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Bashir Ahmad
Nonlinear Analysis and Applied Mathematics (NAAM)-Research Group, Department of Mathematics, Faculty of Science King Abdulaziz University, P.O. Box 80203,Jeddah, Saudi Arabia
Sotiris K. Ntouyas
Department of Mathematics, University of Ioannina, 451 10Ioannina, Greece
Nonlinear Analysis and Applied Mathematics (NAAM)-Research Group, Department of Mathematics, Faculty of Science King Abdulaziz University, P.O. Box 80203,Jeddah, Saudi Arabia