Citation: Cristiano Antonelli et al., Productivity and external knowledge: the italian case, Rivista internazionale di scienze economiche e commerciali mmerciali, 50(1), 2003, pp. 69-90
Citation: Raffaele Paci et Stefano Usai, The role of specialisation and diversity externalities in the agglomeration of innovative activities, Rivista italiana degli economisti, 5(2), 2000, pp. 237-268