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Industry Effects and Appropriability Measures in the Stock Market’s Valuation of R&D and Patents[J] . Iain Cockburn,Zvi Griliches.The American Economic Review . 1988 (2)
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Technological Opportunity and Spillovers of R & D: Evidence from Firms’ Patents, Profits, and Market Value[J] . Adam B. Jaffe.The American Economic Review . 1986 (5)

