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Demand and Supply Influences in R & D Intensity and Productivity Growth[J] . The Review of Economics and Statistics . 1988 (3)
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Innovation, Market Structure, and Firm Size[J] . The Review of Economics and Statistics . 1987 (4)
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R & D Appropriability, Opportunity, and Market Structure: New Evidence on Some Schumpeterian Hypotheses[J] . Richard C. Levin,Wesley M. Cohen,David C. Mowery.The American Economic Review . 1985 (2)