1. Department of Mathematics, Faculty of Science-AL Faisaliah Campus, King Abdul-Aziz University, 21589, Saudi Arabia
2. Department of Mathematics, Faculty for Girls, Bisha University, 61421, Saudi Arabia
3. Center for Undergraduate Studies, University of the Punjab, 54590 Lahore, Pakistan
4. School of Electronics and Information Engineering, Wuhan Donghu University, Wuhan, 430212, P. R. China
5. Department of Mathematical Sciences, Delaware State University, Dover, DE 19901-2277, USA