1Crepon B, Duguet E, Mairesse J. Research, Innovation, and Productiv- ity, An Econometric Analysis at the Firm Level[J].Economics of Inno- vation and New Technology, 1998,7(7).
2Jefferson G, Bai H M, Guan X Let al. R & D Performance in Chinese lndustry[J].Economies of Innovation and New Technology, 2006, (15).
3Verspagen B. R & D and Productivity: A Broad Cross - Section Cross - Country Look[J].Journal of Productivity Analysis, 1995, (6).
4Cameron G. Openness, R & D, and Growth at the Industry Level[D]. PhD.Thesis, University of Oxford, 2004.
