1. CITMAga, Departamento de Estatística, Análise Matemática e Optimización, University of Santiago de Compostela, Santiago de Compostela 15782, Spain
2. Department of Mathematics, College of Sciences and Arts, King Abdulaziz University, Rabigh 21911, Saudi Arabia
3. Nonlinear Analysis and Applied Mathematics (NAAM)-Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University, P. O. Box 80203, Jeddah 21589, Saudi Arabia