[Bian, Dong-fen] Beijing Inst Technol, Sch Math & Stat, Beijing 100081, Peoples R China.
[Fan, Li-li] Wuhan Polytech Univ, Sch Math & Comp Sci, Wuhan 430023, Hubei, Peoples R China.
[He, Lin] Chinese Acad Sci, Acad Math & Syst Sci, Inst Appl Math, Beijing 100190, Peoples R China.
[Zhao, Hui-jiang] Wuhan Univ, Sch Math & Stat, Wuhan 430072, Hubei, Peoples R China.
[Zhao, Hui-jiang] Wuhan Univ, Computat Sci Hubei Key Lab, Wuhan 430072, Hubei, Peoples R China.