À propos de cet article
Publié en ligne: 28 juin 2017
Pages: 271 - 284
Reçu: 05 avr. 2017
Accepté: 28 juin 2017
DOI: https://doi.org/10.21042/AMNS.2017.1.00023
Mots clés
© 2017 I. K. Youssef, M. H. El Dewaik, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Youssef, I. K.
Department of Mathematics, Ain Shams UniversityCairo, Egypt
El Dewaik, M. H.
Department of Basic Science, The British UniversityCairo, Egypt