6[1]Irwin D,Klenow P.Learning by doing in the semiconductor industry[J].Journal of Political Economy,1994,102(6):1200-1227.
7[2]Jaffe A,M Trajtenberg,and R.Henderson.Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations[J].Quarterly Journal of Economics,1993,108:577-598.
8[3]Jaffe A,M Trajtenberg.International Knowledge Flows:Evidence from Patent Citations[R].NBER working paper 6507,1998,April.
9[4]Eaton J,S,Kortum.Trade in Ideas:Patenting and Productivity in the OECD [J].Journal of International Economics,1996,40:251-278.
10[5]Coe D T,E Helpman.International R&D Spillovers [J].European Economic Review,1995,39: 859-887.