1. Department of Mathematics, Huzhou University, Huzhou 313000, China
2. Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering, Changsha University of Science and Technology, Changsha 410114, China
3. Department of Mathematics, Faculty of Science, Jiangsu University, 212013 Zhenjiang, China
4. Department of Mathematics, Obour Institutes, 11828 Cairo, Egypt
5. Department of Mathematics and Statistics, College of Science, Taif University, P. O. Box 11099, Taif 21944, Saudi Arabia
6. Department of Physics and Engineering Mathematics, Faculty of Electronic Engineering, Menoufia University, Menoufia 32952, Egypt