1. DEIS, University of Bologna – V.le Risorgimento 2, 40136 Bologna, Italy. {marco.montali,paolo.torroni,federico.chesani,paola.mello}@unibo.it
2. CENTRIA, Universidade Nova de Lisboa – Quinta da Torre, 2829-516 Caparica, Portugal. m.alberti@fct.unl.pt
3. ENDIF, University of Ferrara – V. Saragat 1, 44100 Ferrara, Italy. evelina.lamma@unife.it