1. LS2N UMR CNRS 6004, NU-ECN, Nantes, France
2. School of Mathematics and Statistics, Nanjing University of Information Science and Technology, Nanjing, China
3. Quartz EA 7393, ENSEA, Cergy, France
4. LCCPS, ENSAM, Hassan II University of Casablanca, Casablanca, Morocco