[1] Sichuan Agr Univ, Coll Econ, Chengdu 610000, Peoples R China
[2] Riphah Int Univ, Dept Math, Faisalabad Campus, Faisalabad, Pakistan
[3] Govt Coll Univ, Dept Math, Faisalabad, Pakistan
[4] Univ Punjab, Dept Comp Sci, Lahore, Pakistan
[5] Anhui Jianzhu Univ, Sch Math & Phys, Hefei 230601, Peoples R China
[6] Qassim Univ, Coll Engn, Dept Mech Engn, Unaizah, Saudi Arabia