共 43 条
[1]
ACS ZJ, 1989, KYKLOS, V42, P171
[4]
ALCACER J, 2004, PATENT EXAMINERS GEN
[5]
[Anonymous], CHALLENGES RES U
[6]
[Anonymous], RES POLICY
[8]
BRANSTETTER L, 2004, ACAD SCI DRIVING SUR
[9]
Cockburn IM, 1998, J IND ECON, V46, P157
[10]
Cohen J., 1983, APPL MULTIPLE REGRES, DOI [10.1002/0471264385.wei0219, DOI 10.1002/0471264385.WEI0219]