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Washington, DC: World Bank, [1998] ; Online-Ausg.
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Washington, DC: World Bank, Policy Research Dept., Environment, Infrastructure, and Agriculture Division, [1995] ; Online-Ausg.
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[S.l.]: SSRN, [2016]
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[S.l.]: SSRN, [2016]
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Washington, DC: World Bank, Development Research Group, [1998] ; Online-Ausg.
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American Economic Association, 1992
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Elsevier BV, 2000
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Elsevier BV, 2000
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Elsevier BV, 1997
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Elsevier BV, 1996