[1] Abdelmalek Essaadi Univ, Fac Sci & Technol, Dept Math, Al Hoceima, Tetouan, Morocco
[2] Lebanese Amer Univ, Dept Comp Sci & Math, Beirut, Lebanon
[3] Inst Space Sci, Bucharest, Romania
[4] Hodeidah Univ, Dept Math, Al Hudaydah, Yemen
[5] Prince Sultan Univ, Dept Math & Sci, POB 66833, Riyadh 11586, Saudi Arabia
[6] China Med Univ, China Med Univ Hosp, Dept Med Res, Taichung 40402, Taiwan
[7] Hashemite Univ, Dept Math, Zarqa, Jordan