1. Laboratory of Applied Mathematics, Badji Mokhtar-Annaba University, P.O. Box 12, 23000 Annaba, Algeria
2. Department of Mathematics, Faculty of Science, University of Jeddah, Jeddah, Saudi Arabia
3. Department of Basic Engineering Sciences, College of Engineering, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 34151, Saudi Arabia
4. Department of Mathematics, Hodeidah University, Al-Hudaydah, Yemen