[1] Taif Univ, Coll Sci, Dept Phys, POB 11099, Taif 21944, Saudi Arabia
[2] Capital Univ Sci & Technol CUST, Dept Math, Islamabad 44000, Pakistan
[3] New Valley Univ, Fac Sci, Dept Math, Al Kharga 72511, Al Wadi Al Gadi, Egypt
[4] Northern Border Univ, Fac Sci, Dept Math, 1321, Ar Ar, Saudi Arabia