[1] Princess Nourah Bint Abdulrahman Univ, Fac Sci, Math Sci Dept, Riyadh 11546, Saudi Arabia
[2] Univ Hafr Al Batin, Fac Sci, Dept Math, POB 1803, Hafar Al Batin 31991, Saudi Arabia
[3] Int Telemat Univ Uninettuno, Sect Math, I-00186 Rome, Italy
[4] Hadhramout Univ, Fac Sci, Dept Math, Hadhramout 50512, Yemen
[5] Jazan Univ, Fac Sci, Dept Math, Jazan 218, Saudi Arabia
[6] Petr Gas Univ Ploiesti, Dept Comp Sci Informat Technol Math & Phys, Ploiesti 100680, Romania