By Andersen Matthew A.   Alston Julian M.   Pardey Philip G.   in American Journal of Agricultural Economics

ISSN:0002-9092|94|5|1247-1248

Oxford University Press‎(2012)‎

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By Alston Julian M.   Chalfant James A.   Piggott Nicholas E.   in Applied Economics

ISSN:1466-4283|34|9|1177-1186

Routledge Ltd‎(2002)‎

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