Abdelbaki Choucha - Univ El Oued, Fac Exact Sci, Dept Math, Lab Operator Theory & PDE Fdn & Applicat, El Oued, Algeria
Salah Boulaaras - Qassim University
Djamel Ouchenane - Amar Teledji Laghouat Univ, Lab Pure & Appl Math, Laghouat, Algeria
Mohamed Abdalla - King Khalid University
Ibrahim Mekawy - Qassim University
Laboratory of Fundamental and Applied Mathematics of Oran (LMFAO), University of Oran 1, Ahmed Benbella, Oran, Algeria