1. Section of Mathematics, International Telematic University Uninettuno, Corso Vittorio Emanuele II, 39, 00186 Roma, Italy
2. Department of Mathematics, Faculty of Sciences, University of Algiers, 2 Street Didouche Mourad, Algiers 16000, Algeria
3. Department of Mathematics, Faculty of Sciences, Djilali Bounaama University of Khemis Miliana, Khemis Miliana 44225, Algeria
4. Laboratory of Nonlinear Partial Differential Equations and History of Mathematics, ENS Kouba, Kouba 16308, Algeria
5. Department of Mathematics, Faculty of Sciences, University of Saad-Dahlab Blida1, Blida 09000, Algeria