[1] Princess Nourah Bint Abdulrahman Univ, Dept Math Sci, Coll Sci, POB 84428, Riyadh 11671, Saudi Arabia
[2] Univ Hail, Dept Math, Fac Sci, Hail 2440, Saudi Arabia
[3] Mansoura Univ, Dept Math, Fac Sci, Mansoura 35516, Egypt
[4] Univ Sierra Leone, Dept Math & Stat, Fourah Bay Coll, Freetown, Sierra Leone
[5] Prince Sattam Bin Abdulaziz Univ, Coll Sci & Humanities Al Kharj, Dept Math, Al Kharj 11942, Saudi Arabia
[6] Mansoura Univ, Dept Stat & Comp Sci, Fac Sci, Mansoura 35516, Egypt