1. Univ. Trás-os-Montes and Alto Douro,Department of Engineering,Vila real,Portugal
2. Univ. Trás-os-Montes and Alto Douro LIAAD-INESCTEC UTAD Pole,Department of Mathematics,Vila real,Portugal
3. Univ. Trás-os-Montes and Alto Douro CRIIS-INESCTEC UTAD Pole,Department of Engineering,Vila real,Portugal
4. Univ. Trás-os-Montes and Alto Douro CPES-INESCTEC UTAD Pole,Department of Engineering,Vila real,Portugal