4GREVEARENT.Network and entrepreneurship -an analysis of social relations,occupational background,and use of contacts during the establishment process[J].Scandinavian Journal of Management,1995,11 (1):1-24.
5PHILIP COOKE.Regional innovation systems--2nd edition:the role of governance in a globalized world[M].Routledge Taylo Francis Group,LONDON AND NEW YORK,HT391.,R3355 2004,7-8,138 -139.