共 9 条
[7]
International R&D spillovers[J] . David T. Coe,Elhanan Helpman.European Economic Review . 1995 (5)
[8]
Technological Opportunity and Spillovers of R & D: Evidence from Firms' Patents, Profits, and Market Value[J] . Adam B. Jaffe.The American Economic Review . 1986 (5)
[9]
R & D and the Productivity Slowdown[J] . Zvi Griliches.The American Economic Review . 1980 (2)