About this article
Published Online: Oct 23, 2017
Page range: 443 - 448
Received: Apr 06, 2017
Accepted: Oct 23, 2017
DOI: https://doi.org/10.21042/AMNS.2017.2.00035
Keywords
© 2017 A.T. El-Dessouky, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
El-Dessouky, A. T.
Department of Mathematics, Faculty of Science, Helwan UniversityCairo, Egypt