Resume
This work is cataloged in the Scientific Portal. Officially published in RISTI - Revista Iberica de Sistemas e Tecnologias de Informacao (2015). Referenced as: "Abreu, A.; Rocha, A.; Cota, M.P.; Carvalho, J.V.".
The complete abstract and full text can be accessed directly at the official DOI: https://doi.org/10.17013/risti.16.108-128