1. Department of Mathematics École Nationale Supérieure d’Ingénieurs de Tunis Tunis University Tunis Tunisia E-mail:
2. Department of Mathematics Atilim University Ankara Turkey
3. Nonlinear Analysis and Applied Mathematics (NAAM) Research Group King Abdulaziz University 21589 , Jeddah Saudi Arabia E-mail:
4. Department of Quantitative Methods for Economics and Business University of Granada Granada Spain
5. PAIDI Research Group FQM-268 University of Jaén Jaén Spain E-mail: