1. Department of Mathematics, Faculty of Science and Arts at Belqarn, University of Bisha, Sabt Al-Alaya, Kingdom of Saudi Arabia
2. Faculty of Sciences, University of Sfax, Sfax, Tunisia
3. Faculty of Sciences, University of Gafsa, Gafsa, Tunisia
4. Division of Mathematics and Physics, School of Education, Culture and Communication, Mälardalen University, Västeras, Sweden