1. Department of Mathematics, Quaid-I-Azam University, Islamabad, Pakistan
2. Department of Basic Sciences, University of Engineering & Technology, Peshawar, Pakistan
3. Department of Mathematics, Quaid-I-Azam University, Islamabad , Pakistan + Nonlinear Analysis and Applied Mathematics (NAAM) Research Group, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
4. Nonlinear Analysis and Applied Mathematics (NAAM) Research Group, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia