Authors
Mouffak Benchohra
Laboratory of Mathematics, Djillali Liabes University of Sidi Bel Abbes,, Sidi Bel Abbes, Algeria
Amel Heris
Laboratory of Mathematics, Djillali Liabes University of Sidi Bel Abbes,, Sidi Bel Abbes, Algeria
© 2017 Mouffak Benchohra, Amel Heris, published by West University of Timisoara
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.