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R&D and productivity in German manufacturing firms. D Harhoff. Economics of Innovation and New Technology . 1998
[2]
"Bounding the Effects of R&D:An Investigation Using Matched Estab-lishment-Firm Data". Adams,J.,and A Jaffe. Round Journal of Economics . 1996
[3]
"Costs of Production,Intra-andInter-Industry R&D Spillovers:The Canadian Evidence.". Bernstein,J.I. Canadian Journal of Economics . 1988