Affiliation: | 1.Laboratory of Pure and Applied Mathematics, Mohamed Khider University of Biskra, BP 145 RP, Biskra, Algeria ;2.Laboratory of Pure and Applied Mathematics, école Normale Supérieure of Laghouat, Trans-Sahara Hwy Laghouat, 04033, Laghouat, Algeria ;3.Department of Mathematics and Statistics, College of Arts and Sciences, American University of Sharjah, P.O.Box 26666, Sharjah, United Arab Emirates ; |