1. School of Mathematics and Statistics, Xi'an Jiaotong University, Xi'an, People's Republic of China
2. Center for Optimization Technique and Quantitative Finance, Xi'an International Academy for Mathematics and Mathematical Technology, Xi'an, People's Republic of China
3. School of Science, Xijing University, Xi'an, People's Republic of China
4. School of Statistics and Management, Shanghai University of Finance and Economics, Shanghai, People's Republic of China