Salah Boulaaras - Qassim University
Abdelbaki Choucha - Univ El Oued, Fac Exact Sci, Dept Math, Lab Operator Theory & PDEs Fdn & Applicat, Box 789, El Oued 39000, Algeria
Bahri Cherif - Qassim University
Asma Alharbi - Qassim University
Mohamed Abdalla - Qassim University
Laboratory of Operator Theory and PDEs: Foundations and Applications, Department of Mathematics, Faculty of Exact Sciences, University of El Oued, Box.789, El Oued 39000, Algeria