The rate of obsolescence of patents, research gestation lags, and the private rate of return to research resources

Pakes, A. & Schankerman, M.ORCID logo (1987). The rate of obsolescence of patents, research gestation lags, and the private rate of return to research resources. In Griliches, Z. (Ed.), R&d, Patents and Productivity (pp. 73-88). University of Chicago Press.
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