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http://web.archive.org/web/20110625064035/http://ecowww.leh.kagoshima-u.ac.jp/staff/kuwabara/Discussion%20Papers%20In%20Economics%20and%20Sociology(issn1347085x)%20et%20al/Discussion%20Papers%20In%20Economics%20and%20Sociology(issn1347085x)%20et%20al/kouki2003/phd27.jpg
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