9PIETROBELLI C. The Socio-Economic Foundations Of Competitiveness: An Econometric Analysis of Ital- ian Industrial Districts[J]. Industry and Innovation, 1998,5(2) : 139- 155.
10TIM PADMORE, HERVER GIBSON. Modelling sys- tems of innovation II. a framework for industrial cluster a- nalysis in regions[J]. Elsevier, 1998,26(6):625-641.