1. College of Mathematics and System Science, Xinjiang University, Ürümqi, China
2. College of Mathematics and System Science, and the Xinjiang Key Laboratory of Applied Mathematics (XJDX1401), Xinjiang University, Ürümqi, China
3. College of Hunan Province, MOE-LCSM, School of Mathematics and Statistics, and the Key Laboratory of Control and Optimization of Complex Systems, Hunan Normal University, Changsha, China
4. Science Program, Texas A and M University at Qatar, Qatar