Authors
Bendehiba Senoussi
Department of Mathematics, Ecole Normale Supérieure de Mostaganem, Algeria
Khaled Beddani
Department of Mathematics, Abdelhamid Ibnbadis University, Mostaganem, Algeria
Abdelaziz Bennour
Department of Mathematics, Abdelhamid Ibnbadis University, Mostaganem, Algeria
