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Bonn: Stollfuss, 1989
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[S.l.]: SSRN, [2012]
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[S.l.]: SSRN, [2011]
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Berlin: Freie Universität Berlin, 2009
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[S.l.]: SSRN, [2019]
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Bonn: Institute of Labor Economics (IZA), 2018
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Bonn: Forschungsinstitut zur Zukunft der Arbeit GmbH (IZA), October 2018
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Bonn: Institute for the Study of Labor (IZA), 2014
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[S.l.]: SSRN, [2013]
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[S.l.]: SSRN, [2012]
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[S.l.]: SSRN, [2012]
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Bonn: Institute for the Study of Labor (IZA), 2012
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[S.l.]: SSRN, [2009]
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[S.l.]: SSRN, [2014]
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[S.l.]: SSRN, [2013]
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[S.l.]: SSRN, [2011]
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[S.l.]: SSRN, [2011]
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Berlin, 2022
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Berlin, 2021
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Bonn: Forschungsinstitut zur Zukunft der Arbeit GmbH (IZA), September 2023