1. Department of Mathematics and Natural Sciences, Prince Mohammad Bin Fahd University, P.O. Box 1664, Al Khobar 31952, Saudi Arabia
2. Department of Mathematics, College of Science and Arts, Muhayil, King Khalid University, P.O. Box 9004, 61413 Abha, Saudi Arabia
3. Department of Civil Engineering, College of Engineering, Qassim University, Unaizah, Saudi Arabia