[1] Southeast Univ, Sch Math, Frontiers Sci Ctr Mobile Informat Commun & Secur, Nanjing 210096, Peoples R China
[2] Purple Mt Labs, Nanjing 211111, Peoples R China
[3] Yonsei Univ, Yonsei Frontier Lab, Seoul 03722, South Korea
[4] Bharathiar Univ, Dept Math, Coimbatore 641046, Tamil Nadu, India
[5] United Arab Emirates Univ, Dept Math Sci, Coll Sci, Al Ain, U Arab Emirates
[6] Bharathiar Univ, Dept Math, Coimbatore 641046, Tamil Nadu, India
[7] Shandong Normal Univ, Sch Math & Stat, Jinan 250014, Peoples R China
[8] Southeast Univ, Sch Math, Nanjing 210096, Peoples R China