共 5 条
[2]
The economic effects of basic research: evidence for embodied knowledge transfer via scientists’ migration[J] . Christian Zellner.Research Policy . 2003 (10)
[4]
Geographical proximity and scientific collaboration[J] . J. S. Katz.Scientometrics . 1995 (1)
[5]
ISSUES IN ASSESSING THE CONTRIBUTION OF RESEARCH AND DEVELOPMENT TO PRODUCTIVITY GROWTH
[J].
BELL JOURNAL OF ECONOMICS,
1979, 10 (01)
:92-116