- "Appropriability, preemption, and firm performance". Strategic Management Journal, Vol. 30, pp. 81-98, 2009.
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 - "R&D and the Patent Premium" (with A. Arora and W. Cohen). International Journal of Industrial Organization, Vol. 26, pp. 1153-1179, 2008.
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- "Patent protection, complementary assets, and firms' incentives for technology licensing," (with A. Arora). Management Science, Vol. 52, No. 2 (February), 2006
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- "Firm Heterogeneity, Imitation, and the Incentives for Cost Reducing R&D Effort." Journal of Industrial Economics. Vol. 53, No. 1 (March), 2005.
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