[1] Northwestern Polytech Univ, Dept Appl Math, Xian 710072, Peoples R China
[2] Univ Management & Technol, Dept Math, Lahore, Pakistan
[3] Nanjing Univ Informat Sci & Technol, Sch Math & Stat, Nanjing 210044, Peoples R China
[4] Northwest Univ, Sch Math, 229 North Taibai Ave, Xian 7100069, Peoples R China
[5] Majmaah Univ, Coll Sci Al Zulfi, Dept Math, Al Majmaah 11952, Saudi Arabia
[6] South Ural State Univ, Res Inst Mech Engn, Dept Vibrat Testing & Equipment Condit Monitoring, Lenin Prospect 76, Chelyabinsk 454080, Russia