1. Department of Mathematics, Physics and Computer Science, Higher Institute of Applied Sciences and Technology of Kairouan; University of Kairouan; Kairouan 3100 Tunisia
2. Department of Mathematics, Faculty of Sciences of Bizerta; University of Carthage; BP W, Jarzouna Bizerta 7021 Tunisia
3. Laboratory of Engineering Mathematics (LR01ES13), Tunisia Polytechnic School; University of Carthage; El Khawarizmi Street Carthage 2078 Tunisia