Affiliation: | 1. College of Science, China University of Petroleum (East China), Qingdao, People's Republic of China;2. Academy of Mathematics and Systems Science, Chinese Academy of Science, Beijing, People's Republic of China;3. Academy of Mathematics and Systems Science, Chinese Academy of Science, Beijing, People's Republic of China;4. School of Statistics, Jiangxi University of Finance and Economics, Nanchang, People's Republic of China |