[1] Mohi ud Din Islamic Univ, Dept Math, Nerian Sharif 12010, Azad Jammu & Ka, Pakistan
[2] Guangxi Minzu Univ, Sch Math & Phys, Nanning 530006, Peoples R China
[3] Natl Univ Technol, NUTECH Sch Appl Sci & Humanities, Islamabad 44000, Pakistan
[4] Lebanese Amer Univ, Dept Mech Engn, Beirut, Lebanon
[5] King Khalid Univ, Fac Sci, Dept Phys, POB 9004, Abha, Saudi Arabia
[6] Hazara Univ, Dept Math & Stat, Mansehra, Pakistan