1. Department of Physics and Applied Mathematics (DPAM), Pakistan Institute of Engineering & Applied Sciences, Nilore, Islamabad
2. Center for Mathematical Sciences (CMS), Pakistan Institute of Engineering & Applied Sciences, Nilore, Islamabad
3. Department of Mathematics, Division of Science and Technology, University of Education, Lahore, Pakistan
4. Department of Mathematics, College of science, King Saud university, Riyadh, Saudi Arabia
5. Department of Mathematics College of Science, Jazan University, Jazan, Saudi Arabia