1Vitor Braga and Chris Gerry. Policies in support of local clusters: A preliminary analysis of the hinterland zone of north Portuguese coast. Paper presented at the 6th EUNIP Conference. Turku, Finland, 5th-6th Dec. 2002.
2Baldwin, Fred D. Business Clusters: Building on local Strengths [J]. Appalachia Magazine 9-10 (2001).
