[1] N China Elect Power Univ, Dept Math & Phys, Beijing 102206, Peoples R China
[2] Jiaxing Univ, Coll Math Phys & Informat Engn, Jiaxing 314001, Peoples R China
[3] Sichuan Normal Univ, Coll Math & Software Sci, Chengdu 610068, Peoples R China
[4] Inst Appl Phys & Computat Math, Beijing 100088, Peoples R China