About this article
Published Online: Dec 31, 2018
Page range: 375 - 379
DOI: https://doi.org/10.2478/disp-2006-0009
© 2006 Hélder Coelho, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Hélder Coelho
Dept. de Informática, Faculdade de Ciências,
Universidade de LisboaLisboa, Portugal