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What Do We Know About Geographical Knowledge Spillovers and Regional Growth?: A Survey of the Literature
The paper provides a survey of theoretical and empirical findings highlighting the question of how geographically limited knowledge diffusion can help to explain clusters of regions with persistently different levels of growth.
Link
http://www.ingentaconnect.com/content/routledg/cres/2006/00000040/00000003/art00007