1. Department of Mathematics, College of Science, University of Ha'il, Ha'il 55425, Saudi Arabia
2. Department of Basic Sciences, General Administration of Preparatory Year, King Faisal University, P.O. Box 400, Al Ahsa 31982, Saudi Arabia
3. Department of Mathematics and Statistics, College of Science, King Faisal University, P.O. Box 400, Al Ahsa 31982, Saudi Arabia
4. Department of Mathematics and Statistics, Bacha Khan University Charsadda, Pakistan