共 6 条
[1]
ISSUES IN ASSESSING THE CONTRIBUTION OF RESEARCH AND DEVELOPMENT TO PRODUCTIVITY GROWTH
[J].
BELL JOURNAL OF ECONOMICS,
1979, 10 (01)
:92-116
[2]
GRILICHES Z, UNPUB R D PATENTS PR
[5]
SCHERER FM, UNPUB R D PATENTS PR
[6]
Schmookler J, 1966, INVENTION EC GROWTH