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Berlin: Berlin-Verl., 2008
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Bochum: Brockmeyer, 1993
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Tübingen: Jung, 1995
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Köln, 1997
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Köln, 1997
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Berlin; Boston: De Gruyter Oldenbourg, [2021]
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Bonn: Institute for the Study of Labor (IZA), 2000
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Bonn: Institute for the Study of Labor (IZA), 2001
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Bielefeld, 2009
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Bonn: Institute for the Study of Labor (IZA), 2000
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Bonn: Institute for the Study of Labor (IZA), 1999
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Budapest: Institut of World Economic Research, 2016