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Berlin [u.a.]: de Gruyter, 1987
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Berlin: Wissenschaftszentrum, 1990
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Frankfurt [u.a.]: Campus Verl., 1975
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Berlin; Boston: De Gruyter, [2019] ; [Online-Ausgabe]
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Bonn, Germany: IZA - Institute of Labor Economics, January 2021
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Bonn, Germany: IZA - Institute of Labor Economics, October 2021
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Bonn, Germany: IZA - Institute of Labor Economics, June 2020
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Bonn: Institute of Labor Economics (IZA), 2020
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Bonn, Germany: IZA - Institute of Labor Economics, May 2020
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Bonn: Institute of Labor Economics (IZA), 2020
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Bonn, Germany: IZA - Institute of Labor Economics, May 2020
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Bonn, Germany: IZA, September 2017
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Bonn, Germany: IZA, November 2017
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Hamburg: HWWI Institute of International Economics, 2011
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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), 2007
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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), 2005
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Bonn: Institute for the Study of Labor (IZA), 2005
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2024