1. Department of Physics and Engineering Mathematics, Higher Institute of Engineering, El-Shorouk, Cairo, Egypt
2. Department of Mathematics, Faculty of Science and Arts, Bozok University, 66100 Yozgat, Turkey
3. Department of Mathematics and Statistics, Tshwane University of Technology, Pretoria-0008, South Africa
4. Operator Theory and Applications Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University, P.O. Box-80203, Jeddah-21589, Saudi Arabia
5. Science Program, Texas A&M University at Qatar, P.O. Box 23874, Doha, Qatar