Authors
Mouffak Benchohra
Djillali Liabes University of Sidi Bel-Abbès, Sidi Bel-Abbès, Algeria
© 2022 Fatima Si Bachir, Saïd Abbas, Maamar Benbachir, Mouffak Benchohra, published by Slovak Academy of Sciences, Mathematical Institute
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.