1. School of Mathematics and Statistics, Central China Normal University, Wuhan, People's Republic of China
2. Département de Mathematiques, Université frères Mentouri Constantine, Constantine, Algeria
3. Physics and Mathematical Engineering Department, Faculty of Electronic Engineering, Menoufiya University, Menouf, Egypt
4. Shenzhen Institutes of Advanced Technology, Chinese Academy of Science, Shenzhen, People's Republic of China