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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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[S.l.]: SSRN, [2020]
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[S.l.]: SSRN, [2019]
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[S.l.]: SSRN, [2017]
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[S.l.]: SSRN, [2013]
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[S.l.]: SSRN, [2012]
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[S.l.]: SSRN, [2011]
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[S.l.]: SSRN, [2009]
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[S.l.]: SSRN, [2010]
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[S.l.]: SSRN, [2010]
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[S.l.]: SSRN, [2006]
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Berlin; Boston: De Gruyter, [1986]
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[S.l.]: SSRN, [2021]
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[S.l.]: SSRN, [2021]
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[S.l.]: SSRN, 2005
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[S.l.]: SSRN, 2005
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[S.l.]: SSRN, 2022
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Bonn, Germany: IZA - Institute of Labor Economics, January 2021