1. School of Statistics and Mathematics Yunnan University of Finance and Economics Kunming People's Republic of China
2. Department of Mathematics College of Science, National University of Defense Technology Changsha People's Republic of China
3. Department of Basic Sciences Nanjing Vocational College of Information Technology Nanjing People's Republic of China
4. Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems School of Mathematical Sciences, Nanjing Normal University Nanjing People's Republic of China