1. Reliability of Materials and Structures Laboratory, University of Bechar, Béchar, Algeria
2. Department of Mathematics, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
3. Department of Mathematics, Faculty of Science, Kafrelsheikh University, Kafrelsheikh, Egypt
4. Laboratory of Mechanics: Modelling and experimentation L2ME, University of Bechar, Algeria