Authors
Nabil Saouli
Applied Mathematics Laboratory, University Badji Mokhtar-Annaba, Annaba, Algeria
Fairouz Zouyed
Applied Mathematics Laboratory, University Badji Mokhtar-Annaba, Annaba, Algeria
© 2020 Nabil Saouli, Fairouz Zouyed, published by Ovidius University of Constanta
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.