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Do Spillovers Matter when Estimating Private Returns to R & D?

Markus EberhardtChristian HelmersHubert Strauß

出版	Leverhulme Centre for Research on Globalisation and Economic Policy, 2010
URL	http://books.google.com.hk/books?id=kDnwxwEACAAJ&hl=&source=gbs_api