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Washington, D.C: The World Bank, 2015
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World Bank, Washington, DC, 2003
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World Bank, Washington, DC, 2013
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Washington, DC, 2010
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World Bank, Washington, DC, 2006
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Washington, DC, 2008
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Washington, DC, 2014
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Washington, DC, 2014
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Berlin, Wien, Zürich: Beuth Verlag, 2009
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World Bank, Washington, DC, 2009
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World Bank, Washington, DC, 2016
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2023
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International Journal of Innovative Research & Development (GlobeEdu), 2019
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International Journal of Innovative Research & Development (GlobeEdu), 2019
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Wiley, 2002