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Bad Homburg v.d.H. [u.a.]: Gehlen, 1967
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Berlin: Verl. der Nation, 1968
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Baden-Baden: Nomos Verl.-Ges., 1999
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Hamburg: Hamburger Edition HIS, 2020
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Manchester: School of Social Sciences, The University of Manchester, March 2024
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Maastricht: Global Labor Organization (GLO), [2018]
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Fribourg: University of Fribourg, Switzerland, Faculty of Economics and Social Sciences, 2016
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World Bank, Washington, DC, 2018