1. LR Analyse Non‐Linéaire et Géométrie, LR21ES08, Department of Mathematics, Faculty of Sciences of Tunis University of Tunis El Manar Tunis Tunisia
2. UR Analysis and Control of PDEs, UR13ES64, ISCAE University of Manouba Manouba Tunisia
3. UR Analysis and Control of PDEs, UR13ES64, Department of Mathematics, Faculty of Sciences of Tunis University of Tunis El Manar Tunis Tunisia