1. Department of Mathematics, College of Science, Jouf University, Sakaka 72311, Saudi Arabia
2. Department of Mathematics, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
3. Department of Mathematics, College of Science Al-Zulfi, Majmaah University, P.O. Box 66, Al-Majmaah 11952, Saudi Arabia
4. Department of Mathematics, University of New Mexico, Gallup, NM 87301, USA