About this article
Published Online: Dec 31, 2018
Page range: 42 - 64
DOI: https://doi.org/10.2478/disp-2001-0003
© 2019 Luís Moniz Pereira, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Luís Moniz Pereira
Dep. de Informática Faculdade de Ciências e Tecnologia Universidade Nova de Lisboa Monte de Caparica 2825-114 Caparica ,Lisboa, Portugal