Authors
M. A. Ighachane
mohamedamineighachane@gmail.com
Department of Mathematics, Faculy of Sciences-Semlalia, University Cadi Ayyad, Morocco
M. Akkouchi
Department of Mathematics, Faculy of Sciences-Semlalia, University Cadi Ayyad, Morocco
mohamedamineighachane@gmail.com
© 2020 M. A. Ighachane, M. Akkouchi, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.