共 13 条
- [12] The Geographic Sources of Innovation: Technological Infrastructure and Product Innovation in the United States[J] . Maryann P. Feldman,Richard Florida.Annals of the Association of American Geographers . 1994 (2)
- [13] Patent Statistics as Economic Indicators: A Survey[J] . Zvi Griliches.Journal of Economic Literature . 1990 (4)