共 37 条
[24]
IMITATION COSTS AND PATENTS - AN EMPIRICAL-STUDY
[J].
ECONOMIC JOURNAL,
1981, 91 (364)
:907-918
[25]
MCGINNIS R, 1981, AM SOCIOL REV, V46, P422
[26]
MUNOZ E, 1989, NUEVO SIGLO JUN, P73
[27]
Pakes A., 1984, Z. Griliches, R D, Patents, P55
[28]
Pavitt K., 1988, Handbook of Quantitative Studies of Science and Technology, DOI DOI 10.1016/B978-0-444-70537-2.50021-0
[30]
RIPOLL P, 1990, POLITICA CIENTIFICA, V21, P5