Authors
Hakima Bouhadjera
Badji Mokhtar-Annaba University, Faculty of Sciences Department of Mathematics, Laboratory of Applied Mathematics, Annaba, Algeria
Ouarda Saïfia
Chadli Ben Djedid University, Faculty of Sciences and Technology, Department of Mathematics, El-Tarf, Algeria
Sofiane Ouldji
Badji Mokhtar-Annaba University, Faculty of Sciences Department of Mathematics, Laboratory of Applied Mathematics, Annaba, Algeria