1. College of Mathematics and System Sciences, Xinjiang University, 830064, P. R. China
2. Department of Mathematics, Huzhou University, Zhejiang Huzhou 313000, P. R. China
3. Department of Mathematics, Shanghai Normal University, Shanghai 200234, P. R. China
4. Institute of Applied System Analysis, Jiangsu University, Jiangsu Zhenjiang 212013, P. R. China