1. Department of Mathematics, Faculty of Science, University of Tabuk, Tabuk 71491, Saudi Arabia
2. Department of Mathematics, Tamralipta Mahavidyalaya, West Bengal 721636, India
3. Department of Mathematical Sciences, George Mason University, Fairfax, VA 22030, USA
4. Department of Biology, Faculty of Science, University of Tabuk, Tabuk 71491, Saudi Arabia