Affiliation: | 1.Department of Statistics and Finance, University of Science and Technology of China, Hefei, 230026, China ;2.School of Statistics and Mathematics, Zhejiang Gongshang University, Hangzhou, 310018, Zhejiang, China ;3.Acacdemy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing, 100190, China ;4.Department of Mathematics and Statistics, York University, Toronto, M3J 1P3, Canada ; |