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- [9] R&D and Technology Transfer: Firm-Level Evidence from Chinese Industry[J] . Albert G. Z. Hu,Gary H. Jefferson,Qian Jinchang.Review of Economics and Statistics . 2005 (4)
- [10] International Data on Educational Attainment: Updates and Implications .2 Barro R,Jong-Wha Lee. CID Working Paper No 42 . 2000