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Do subsidies have positive impacts on R&D and innovation activities at the firm level?[J] . Tommy H. Clausen.Structural Change and Economic Dynamics . 2009 (4)
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Two for the price of one?[J] . Kris Aerts,Tobias Schmidt.Research Policy . 2008 (5)
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Innovation, imitation, and growth with cumulative technology[J] . Toshihiko Mukoyama.Journal of Monetary Economics . 2003 (2)