Institution: | 1. Department of Mathematics, Quaid-I-Azam University 45320, 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. Heriot Watt University, Edinburgh Campus, Edinburgh EH14 4AS, United Kingdom |