5Leonard W N. Research and Development in Industrial Growth [J]. Journal of Political Economy, 1971,79 (2) : 232 - 56.
6Branch B. Research and Development Activity and Profitability: A Distributed Lag Analysis [ J]. Journal of Political Economy, 1974,82 (82); 999-1011.
7Dietmar Haiiioff. R&D and Productivity in German Manufacturing Firms [ j]. Economics of Innovation and New Technology, 1998,(6): 29-50.
8Chambers D, Jennings R, Ii R B T. Excess Returns to R&D - Intensive Firms [ J] . Review of Accounting Studies,2002 , 7 ( 2 -3): 133- 158,26.
9Lin B W, Lee Y,Hung S C. R&D Intensity and Commercialization Orientation Effectson Financial Performance [ j]. Journal of Business Research, 2006,59 (6): 679 -685.
