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[6]
RD boundaries of the firm: An estimation of the double-hurdle model on commissioned RD, joint RD, and licensing in Japan. Kenta Nakamura,Hiroyuki Odagiri. Economics of Innovation and New Technology . 2005
[7]
Internal Versus External R&D: A Study of R&D Choice with Sample Selection[J] . James H. Love,Stephen Roper.  International Journal of the Economics of Business . 2002 (2)