[1] Univ Punjab, Dept Math, Quaid e Azam Campus, Lahore 54590, Pakistan
[2] Univ Lahore, Dept Math & Stat, Lahore 54000, Pakistan
[3] Univ Tabuk, Dept Math, Fac Sci, POB 741, Tabuk 71491, Saudi Arabia
[4] Future Univ Egypt, Fac Engn & Technol, New Cairo 11835, Egypt
[5] King Khalid Univ, Dept Mech Engn, Coll Engn, Abha 61421, Saudi Arabia
[6] Super Univ, Fac Comp Sci & Informat Technol, Lahore 54000, Pakistan