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Brussels: European Commission, Directorate-General for Economic and Financial Affairs, 2001
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Washington, D.C.: International Monetary Fund, 1999
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Aldershot [u.a.]: Ashgate, 1998
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Bonn: Institute for the Study of Labor (IZA), 2007
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Bonn: Institute for the Study of Labor (IZA), 2012
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London: Queen Mary University of London, School of Economics and Finance, 2010
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Bonn: Institute for the Study of Labor (IZA), 2010
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Munich: Center for Economic Studies and ifo Institute (CESifo), 2012
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Jena: Friedrich Schiller University Jena and Max Planck Institute of Economics, 2007
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Washington, D.C: International Monetary Fund, 1999
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Amsterdam: Amsterdam Institute for Advanced labour Studies, July 2017
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Bonn: ZEI, 2001