[1] Shanghai Normal Univ, Dept Math, Shanghai 200234, Peoples R China
[2] Guangdong Univ Finance, Dept Appl Math, Guangzhou 510521, Guangdong, Peoples R China
[3] Sci Comp Key Lab Shanghai Univ, Shanghai 200234, Peoples R China
[4] E Inst Shanghai Univ, Div Computat Sci, Shanghai 200234, Peoples R China