Institution: | 1. Department of Mathematics, Quaid-I-Azam University, 45320 Islamabad, 44000, Pakistan;2. Nonlinear Analysis and Applied Mathematics (NAAM) Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University, P. O. Box 80257, Jeddah 21589, Saudi Arabia;3. Department of Mathematics, COMSATS Institute of Information Technology, Sahiwal, 57000, Pakistan |