1. Faculty of Technology, University Djillali Liabes, Sidi bel Abbes, Algeria.
2. Laboratoire RTFM, Ecole Nationale Polytechnique Maurice Audin, Oran, Algeria.
3. Laboratoire LMPM, University Djillali Liabes, Sidi bel Abbes, Algeria.
4. Laboratoire LABAB, Ecole Nationale Polytechnique Maurice Audin, Oran, Algeria.