1. Financial Mathematics and Actuarial Science (FMAS)-Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
2. Department of Mathematics, COMSATS University Islamabad, Islamabad 44000, Pakistan
3. Department of Applied Mathematics, University Politehnica of Bucharest, 060042 Bucharest, Romania