共 27 条
- [21] Patent Statistics as Economic Indicators: A Survey[J] . Zvi Griliches.Journal of Economic Literature . 1990 (4)
- [23] Technological Opportunity and Spillovers of R & D: Evidence from Firms’ Patents, Profits, and Market Value[J] . Adam B. Jaffe.The American Economic Review . 1986 (5)
- [24] Spatial data analysis with GIS:An introduction to application in the social sciences. Anselin L. National Center for Geographic Information Analysis Working Paper . 1992