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Freiburg: Universität, 2013
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Bonn: Institute for the Study of Labor (IZA), 2009
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Berlin: Deutsches Institut für Wirtschaftsforschung (DIW), 2004
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Bonn: Institute for the Study of Labor (IZA), 2003
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Kiel: Kiel Institute for World Economics (IfW), 2003
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Kiel: Kiel Institute for World Economics (IfW), 2003
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Bonn: Institute for the Study of Labor (IZA), 2003
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Kiel: Kiel Institute of World Economics (IfW), 2002
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Bonn: Institute for the Study of Labor (IZA), 2002
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Uppsala: Institute for Evaluation of Labour Market and Education Policy (IFAU), 2012
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Bonn: Institute for the Study of Labor (IZA), 2009
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Bonn: Institute for the Study of Labor (IZA), 2004
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Bonn: Institute for the Study of Labor (IZA), 2002
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New Haven, CT: Yale University, Economic Growth Center, 2001
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Bonn: Institute for the Study of Labor (IZA), 2001
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Bonn: Institute for the Study of Labor (IZA), 2010
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Münster; New York: Waxmann, 2014
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2013
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Ernst Reinhardt, GmbH & Co. KG, 2012
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Springer Science and Business Media LLC, 2011