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1991
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Bonn: Institute for the Study of Labor (IZA), 2008
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Munich: Center for Economic Studies and ifo Institute (CESifo), 2010
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Bonn: Institute for the Study of Labor (IZA), 2003
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Bonn: Institute for the Study of Labor (IZA), 2003
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Bonn: Institute for the Study of Labor (IZA), 2008
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Nürnberg: Institut für Arbeitsmarkt- und Berufsforschung (IAB), 2006
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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), 2003
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Heidelberg: Springer, 2013
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Munich: Center for Economic Studies and ifo Institute (CESifo), 2011
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Bonn: Institute for the Study of Labor (IZA), 2011
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Munich: Center for Economic Studies and ifo Institute (CESifo), 2009
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Amsterdam: SEO Economisch Onderzoek, Februari 2022