[1] Univ Peshawar, Dept Math, Sheikh Taimur Acad, Block II, Peshawar, Pakistan
[2] King Saud Univ, Coll Engn, Ind Engn Dept, Riyadh, Saudi Arabia
[3] Lebanese Amer Univ, Dept Comp Sci & Math, Beirut, Lebanon
[4] Jiangsu Univ, Sch Math Sci, Zhenjiang, Peoples R China
[5] City Univ Sci & Informat Technol, Math Dept, Peshawar, Pakistan