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Köln: Volk, c 1968
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Leipzig; Stuttgart; Düsseldorf: Klett Schulbuchverl. Leipzig, 2003
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[S.l.]: SSRN, [2018]
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[S.l.]: SSRN, [2020]
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[S.l.]: SSRN, [2020]
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[S.l.]: SSRN, [2019]
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[S.l.]: SSRN, [2019]
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[Erscheinungsort nicht ermittelbar]: Universitätsverlag Göttingen, 2010
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Göttingen: V&R unipress, [2022]
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[S.l.]: SSRN, 2022
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Bonn, Germany: IZA - Institute of Labor Economics, November 2021
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Bonn: Institute of Labor Economics (IZA), 2021
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[Bonn]: ECONtribute, January 2024
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Bonn and Cologne: University of Bonn and University of Cologne, Reinhard Selten Institute (RSI), 2024
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Kalamazoo, MI: W.E. Upjohn Institute for Employment Research, 10-4-2023
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Bonn, Germany: IZA - Institute of Labor Economics, October 2023
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Oxford: Centre for the Study of African Economies, September 25, 2023
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Bonn: Institute of Labor Economics (IZA), 2023
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Kalamazoo, MI: W.E. Upjohn Institute for Employment Research, 2023
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Bonn: ECONtribute, April 2022