1. Department of Mathematics, Faculty of Science, Jiangsu University, 212013 Zhenjiang, China
2. Department of Mathematics, Obour High Institute for Engineering and Technology, 11828 Cairo, Egypt
3. Department of Mathematics, Mirpur University of Science and Technology, Mirpur 10250 (AJK), Pakistan
4. Department of Mathematics and Statistics, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia