1. Faculty of Exact Sciences and Computer Science, LMAM Laboratory and Department of Mathematics, Mohamed Seddik Ben Yahia University, Jijel, Algeria
2. Faculty of Science and Technology, Mohamed Seddik Ben Yahia University, Jijel, Algeria
3. LANOS Laboratory, Badji-Mokhtar University, Annaba, Algeria
4. Department of Mathematics, 8 Mai 1945 University, Guelma, Algeria