Vol. 15 No. 6 (2018): Mathematical Sciences
Walailak Journal of Science and Technology Volume 15, Number 6, June 2018
ISSN 2228-835X (Online)
This is an Open Access journal, by Walailak University.
All material is licensed under a terms of the Creative Commons Attribution 4.0 International (CC-BY-NC-ND 4.0) licence, unless otherwise stated.