1. Applied Mathematics and Didactic Laboratory, Informatic and Mathematics Department, Ecole Normale Supérieure El Katiba Assia Djebar, Constantine, Algeria
2. Mathematics and Decision Sciences Laboratory, Department of Mathematics, Frères Mentouri University, Constantine, Algeria
3. Department of Mathematics, Hodeidah University, Po. Box 3114, Al Hudaydah, Yemen
4. Yanbu Industrial College, The Royal Commission for Jubail and Yanbu, Yanbu 30436, Saudi Arabia