1. DEGEIT, University of Aveiro, Portugal & IN+, LARSyS, Instituto Superior Técnico, Universidade de Lisboa, Portugal & DINÂMIA'CET – Iscte, University Institute of Lisbon, Portugal & CeBER, Faculty of Economics, University of Coimbra, Portugal
2. IN+, LARSyS, Instituto Superior Técnico, Universidade de Lisboa, Portugal