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[Washington, D.C]: World Bank, [2004] ; Online-Ausg.
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Washington, D.C: The World Bank, 2004 ; Online-Ausg.
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[Washington, D.C]: World Bank, [2004] ; Online-Ausg.
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Washington, D.C: World Bank, [2003] ; Online-Ausg.
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Washington, D.C: World Bank, Education and Social Policy Dept, [1995] ; Online-Ausg.
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World Bank, Washington, DC, 2003
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Informa UK Limited, 2001
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Wiley, 2000
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Informa UK Limited, 1996
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Elsevier BV, 1992
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BMJ, 2016