1. Department of Mathematical Sciences, Delaware State University, Dover, DE, USA.
2. Department of Mathematics, Kuztown University of Pennsylvania, Kuztown, PA, USA.
3. Faculty of Science, Department of Mathematics, King Abdulaziz University, Jeddah, Saudi Arabia.
4. Faculty of Science, Department of Mathematics, Beni-Suef University, Beni-Suef, Egypt.
5. Faculty of Science for Girls, Department of Mathematics, King Abdulaziz University, Jeddah, Saudi Arabia.
6. Canino School of Engineering Technology, State University of New York, Canton, Canton, NY, USA.
7. Department of Mathematics, Howard University, Washington, DC, USA.