Affiliation: | 1. Institute of Mathematics, School of Mathematical Sciences, Fudan University, Shanghai 200433, China;2. Key Laboratory of Mathematics for Nonlinear Sciences (Fudan University), Ministry of Education, China;3. Department of Mathematics, Shandong University at Weihai, Weihai 264200, China;4. Department of Finance and Control Sciences, School of Mathematical Sciences, Fudan University, Shanghai 200433, China |