6Porter,Michael E.Clusters and new economics of competition.Harvard Business Review.Nov.- Dec.1998.pp77-90.
7Sennett,James.Clusters,co-location and external sources of knowledge:the case of small instrument and control firms in the London region.Planning Practice and Research,Vol.16,No.1,2001.pp21-37.
8Gordon,Iran R.and McCann,Philip.Industrial clusters:complexes,agglomeration and /or social networks?[J].Urban Studies,Vol.37,No.3,2000. pp513-532.
9Schmitz,H.and Nadvi,K.Clustering and industrialization:introduction.World Development.Vol.27,No.9,1999.pp1503-1514.
10Granovetter, M.Economic action and social structure:the problem of emeddedness.American Journal of Sociology,No.91,1985.pp481-510.