Authors
Mohammed Abdellaoui
mohammed.abdellaoui3@usmba.ac.ma
University of Fez, Faculty of Sciences Dhar El Mahraz, Laboratory LAMA, Department of Mathematics, Morocco
mohammed.abdellaoui3@usmba.ac.ma
© 2019 Mohammed Abdellaoui, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.