4[1]Nadiri,M.Ishaq.Innovation and Technological Spillovers. NBER working paper 4223,1993.
5[2]Bernstein,Jeffrey I.Costs of Production,Intra and interindustry R＆ D Spillover.Canadian Evidence.Candian Journal of Economics,1988,21(3):324-347.
6[3]Bernstein,Jeffrey I.and Nadiri,M.Ishaq.Product Demand,Cost of Production,Spillovers,and the Social Rate of Return of R＆ D.NBER working paper 3625,1991.
7[4]Nadiri,M.Ishaq and Manuneas,Theofanis P.The Effects of Public Infrastructure and R＆ D Capital on the Cost Structure and Performance of U.S.Manufacturing Industries.Paper presented at the NBER Summer Institute,July 22,1991.
8[5]Jones,Charles I.and Williams,John C.Measuring the Social Return to R＆ D. Quarterly Journal of Economics,998,113(4):1119-1135.
9[6]Mansfield,. R＆ D and Innovation: Some Empirical Findings.In R＆ D,Patents and Productivity.edited by Zvi Griliches.Chicago:1984,University of Chicago Press: 127-148.
10[7]Monhnen,Pierre.Relationship between R＆ D and Productivity Growth in Canada and Other Major Industrialized Countries.Mimeo.1990.
7ESCRIBANO A,FOSFURI A,TRIBO J A.Managing knowledge spillovers:the impact of absorptive capacity on innovation performance[J].Universidad Carlos Ⅲ de Madrid,2002(5):123-127.
8FREEMAN C.Networks of innovators:a synthesis of research issues[J].Research Policy,1991,20(1):499-514.
9TODTLING F,KAUFMANN A.Innovation.systems in regions of Europe-a comparative perspective[J].European Planning Studies,1999 (6):699-719.
10MAURSETH P B,VERSPAGEN B.Knowledge spillovers in Europe:a patent citations analysis[J].The Scandinavian Journal of Economics,2002,104 (4):531-546.
