Resume
This work is cataloged in the Scientific Portal. Officially published in RISTI - Revista Iberica de Sistemas e Tecnologias de Informacao (2018). Referenced as: "Carvalho, J.V.; Abreu, A.; Rocha, Á.".
The complete abstract and full text can be accessed directly at the official DOI: https://doi.org/10.17013/risti.27.0