By List J.A.   Co C.Y.   in Journal of Environmental Economics and Management

ISSN:0095-0696|40|1|1-20

Academic Press‎(2000)‎

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By Strazicich M.C.   Co C.Y.   Lee J.   in Economics Letters

ISSN:0165-1765|70|3|405-412

Elsevier‎(2001)‎

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