[1] Henan Univ, Sch Math & Informat Sci, Kaifeng 475001, Peoples R China
[2] Chinese Acad Sci, Yantai Inst Coastal Zone Res Sustainable Dev, Yantai 264003, Peoples R China
[3] Lanzhou Univ, Inst Bioinformat, Sch Math & Stat, Lanzhou 730000, Peoples R China