Institution: | (1) Department of Applied Mathematics, College of Sciences, Chongqing University, Chongqing, China;(2) Present address: Department of Applied Mathematics, Hong Kong Polytechnic University, Kowloon, Hong Kong;(3) Chinese Academy of Sciences, Institute of Systems Science, Beijing, China;(4) Department of Applied Mathematics, Hong Kong Polytechnic University, Kowloon, Hong Kong |