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[S.l.]: SSRN, [2014]
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Washington, D.C: The World Bank, 2016
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[S.l.]: SSRN, [2017]
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Cambridge, Mass: National Bureau of Economic Research, December 2015
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[S.l.]: SSRN, [2016]
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World Bank, Washington, DC, 2016
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[S.l.]: SSRN, [2017]
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[S.l.]: SSRN, 2010
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Washington, D.C: The World Bank, 2018
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Berlin: Deutsches Institut für Wirtschaftsforschung (DIW), 2009
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World Bank, Washington, DC, 2018
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[S.l.]: SSRN, 2010
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World Bank, Washington, DC, 2017
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Washington, D.C: World Bank, 2013
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BioMed Central, 2013
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Washington, DC: World Bank, 2013
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Elsevier BV, 2010
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Elsevier BV, 2014
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Elsevier BV, 2011
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Elsevier BV, 2009