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Munich: CESifo, 2000
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Tübingen: Mohr Siebeck, 2000
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Tübingen: Mohr Siebeck, 2000
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Bonn, Germany: IZA, March 2018
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Bonn: Institute for the Study of Labor (IZA), 2007
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Mannheim: ZEW, 2009
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Mannheim: ZEW, 2010
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Munich: CESifo, Center for Economic Studies & Ifo Institute, 2018
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Munich: CESifo, Center for Economic Studies & Ifo Institute, September 20, 2017
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Munich: Center for Economic Studies and Ifo Institute (CESifo), 2004
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Bonn: Institute for the Study of Labor (IZA), 2010
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Hannover: Universität Hannover, Wirtschaftswissenschaftliche Fakultät, 2002
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Munich: Center for Economic Studies and Ifo Institute (CESifo), 2003
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Munich: Center for Economic Studies and ifo Institute (CESifo), 2011
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Munich: Center for Economic Studies and ifo Institute (CESifo), 2005
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[Hannover]: [Fachbereich Wirtschaftswissenschaften, Universität Hannover], 2002
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Bonn: Institute for the Study of Labor (IZA), 2011
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Bonn: Institute for the Study of Labor (IZA), 2008
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Bonn: Institute for the Study of Labor (IZA), 2005
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Uppsala: Uppsala University, Department of Economics, 2002