机构:
Beijing Normal Univ, Sch Math Sci, Beijing 100875, Peoples R China
Swansea Univ, Dept Math, Swansea SA2 8PP, W Glam, Wales
Beijing Normal Univ, Lab Math & Complex Syst, Beijing 100875, Peoples R ChinaBeijing Normal Univ, Sch Math Sci, Beijing 100875, Peoples R China