Resume
This work is cataloged in the Scientific Portal. Officially published in Atas da 17{\textordfeminine (2017). Referenced as: "Nuno Coelho; Universidade Trás-os-Montes e Alto Douro; Portugal; Benjamim Fonseca; António Castro; Instituto Superior de Engenharia do Porto".
The complete abstract and full text can be accessed directly at the official DOI: https://doi.org/10.18803/capsi.v17.127-143