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Tübingen: Mohr, 1986
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Tübingen: Mohr, 1983
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Munich: Center for Economic Studies and ifo Institute (CESifo), 2012
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Geneva: World Trade Organization (WTO), 2012
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World Bank, Washington, DC, 2000
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World Bank, Washington, DC, 2015
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World Bank, Washington, DC, 2001
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World Bank, Washington, DC, 2016
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World Bank, Kampala, Uganda, 2015
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World Bank, Washington, DC, 2003
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World Bank, Washington, DC, 2003
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Washington, DC: World Bank, 1997
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Washington, DC, 2010
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Washington, DC: World Bank, 2012
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World Bank, Washington, DC, 2010
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World Bank, Washington, DC, 2010
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SAGE Publications, 1987