共 50 条
- [15] Determinants of patent quality in U.S. manufacturing: technological diversity, appropriability, and firm size The Journal of Technology Transfer, 2018, 43 : 1083 - 1106
- [18] Investment deficits drain U.S. economy Forum for Applied Research and Public Policy, 1993, 8 (04):
- [19] Determinants of the diffusion of U.S. digital telecommunications Journal of Evolutionary Economics, 2001, 11 : 249 - 261