1. Department of Mathematics, College of Science, Jouf University, Aljouf, Saudi Arabia
2. University of Sfax, Faculty of Sciences, Department of Mathematics, BP 1171, 3000 Sfax, Tunisia
3. National School of Engineering, Department of Electrical Engineering, CEM lab, BP W, 3038 Sfax, Tunisia
4. College of Mathematics and Information Science, Shaanxi Normal University, Xi’an 710119, China