Affiliation: | 1. School of Mathematical Sciences, Shanxi University, Taiyuan, Shanxi 030006, PR China;2. Department of Mathematics, University of Pittsburgh, Pittsburgh, PA 15260, USA;3. Department of Mathematics, Harbin Institute of Technology, Heilongjiang, 150001, PR China;4. Center for Financial Engineering, Soochow University, Suzhou, 215006, PR China |