[1] Capital Univ Sci & Technol CUST, Dept Math, Islamabad 44000, Pakistan
[2] Mohammed V Univ Rabat, LaMCScI Lab, Fac Sci, BP 1014, Rabat, Morocco
[3] Prince Sattam bin Abdulaziz Univ, Dept Math, Coll Arts & Sci, Wadi Aldawaser 11991, Saudi Arabia
[4] New Valley Univ, Dept Math, Fac Sci, Al Kharga 72511, Al Wadi Al Gadi, Egypt
[5] Northern Border Univ, Dept Math, Fac Sci, Ar Ar 1321, Saudi Arabia