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Journal Article Innovation and Learning: The Two Faces of R & D Get access Wesley M. Cohen, Wesley M. Cohen Carnegie Mellon University Search for other works by this author on: Oxford Academic Google Scholar Daniel A. Levinthal Daniel A. Levinthal Carnegie Mellon University Search for other works by this author on: Oxford Academic Google Scholar The Economic Journal, Volume 99, Issue 397, 1 September 1989, Pages 569–596, https://doi.org/10.2307/2233763 Published: 01 September 1989
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Cohen et al. (1989) studied this question.
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