1. Mathematical Institute of the Serbian Academy of Sciences, Beograd + King Abdulaziz University, Faculty of Science, Department of Mathematics, Operator Theory and Applications Research Group, Jeddah, Saudi Arabia
2. King Abdulaziz University, Faculty of Science, Department of Mathematics, Operator Theory and Applications Research Group, Jeddah, Saudi Arabia
3. King Abdulaziz University, Faculty of Science, Department of Mathematics, Operator Theory and Applications Research Group, Jeddah, Saudi Arabia + Mansoura University, Faculty of Science, Mathematics Department, Mansoura, Egypt