Authors
Chems Eddine Berrehail
Department of Mathematics, University of Annaba, Annaba, Algeria
Zineb Bouslah
m2edp2014.bouslah.zineb@gmail.com
Department of Mathematics, University of Annaba, Annaba, Algeria
m2edp2014.bouslah.zineb@gmail.com
© 2020 Chems Eddine Berrehail, Zineb Bouslah, Amar Makhlouf, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.