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EPO vs. USPTO Citation Lags
The paper estimates the diffusion and obsolescence of technological knowledge by technological field, country and type of institutions that generates it. Using a quasi-structured model, the authors test whether the observed processes of knowledge diffusion and obsolescence reflect the specific institutional mechanism generating them.
Geography
Link
ftp://ftp.unibocconi.it/pub/RePEc/cri/papers/WP161Montobbio.pdf