共 24 条
[12]
Ownership, Government R&D, Private R&D, and Productivity in Chinese Industry[J] . Albert Guangzhou Hu.Journal of Comparative Economics . 2001 (1)
[13]
Threshold effects in non-dynamic panels: Estimation, testing, and inference[J] . Bruce E. Hansen.Journal of Econometrics . 1999 (2)
[14]
International R&D spillovers[J] . David T. Coe,Elhanan Helpman.European Economic Review . 1995 (5)
[15]
The Economics of Industrial Innovation .2 Freeman,C. . 1997

