Affiliation: | 1. Department of Mathematics, Quaid-I-Azam University 45320, Islamabad 44000, Pakistan.; 2. Nonlinear Analysis and Applied Mathematics (NAAM) Research Group, Faculty of Science, King Abdulaziz University P. O. Box 80203, Jeddah 21589, Saudi Arabia.; Bascom Palmer Eye Institute, University of Miami School of Medicine;, UNITED STATES, |