1. Department of Applied Mathematics and Statistics, Institute of Space Technology, Islamabad 44000, Pakistan
2. Mathematics Department College of Sciences, Majmaah University, Majmaah 11952, Saudi Arabia
3. Mathematics Department, Faculty of Sciences Aswan University, Aswan 81528, Egypt
4. Department of Humanities and Sciences, School of Electrical Engineering and Computer Sciences (SEECS), National University of Sciences and Technology (NUST), Islamabad, Pakistan