1. Anselin L (1988) Spatial econometrics: methods and models. Kluwer, Dordrecht
2. Anselin L, Florax R (1995). New directions in spatial econometrics, Springer, Berlin
3. Barro RJ, Sala-i-Martin X (1995) Economic growth. McGrow Hill, New York
4. Becattini G (1990) The Marshallian industrial district as a socio-economic notion. In: Pyke F, Becattini G, Sengenberger W (eds) industrial districts and interfirm cooperation in Italy. International Institute of Labour Studies, Genevra, pp 37–51
5. Biehl D (1986) The contribution of infrastructure to regional development, Regional Policy Division. European Community, Brussels