共 20 条
[4]
BOUND J, 1992, AM ECON REV, V82, P371
[5]
CARD D., 1996, 5487 NBER
[6]
COE D, 1995, EUROPEAN EC REV, V45, P859
[7]
DESJONQUERES T, 1998, UNPUB ANOTHER NAIL C
[8]
Feenstra RC, 1996, AM ECON REV, V86, P240
[10]
Griliches Z., 1991, ECON INNOV NEW TECH, V1, P183, DOI DOI 10.1080/10438599100000001