[1] Hohai Univ, Coll Mech & Engn Sci, Nanjing 211100, Peoples R China
[2] Guangxi Minzu Univ, Ctr Appl Math Guangxi, Sch Math & Phys, Nanning 530006, Peoples R China
[3] King Khalid Univ, Coll Sci, Dept Math, Abha, Saudi Arabia
[4] Mohi ud Din Islamic Univ, Dept Math, Nerian Sharif 12010, Azad Jammu & Ka, Pakistan