1. Unit of Specialized Structures, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
2. Department of Information Systems, Centro ALGORITMI, University of Minho, Guimarães, Portugal
3. Department of Engineering, Centre for the Research and Technology of Agro-Environmental and Biological Sciences, CITAB, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal