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Groningen: Groninger Museum, 1979
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Nürnberg, 1780
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Adliswil/ZH; Lottstetten: Edition Kunzelmann, [1987]
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Lüneburg: Leuphana Universität Lüneburg, Institut für Volkswirtschaftslehre, 2007
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Berlin: Freie Universität Berlin, 2008
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Montréal: Université du Québec à Montréal, École des sciences de la gestion (ESG UQAM), Groupe de recherche sur le capital humain (GRCH), 2024
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Stockholm: Research Institute of Industrial Economics (IFN), 2018
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Canterbury: University of Kent, Department of Economics, 1998
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Maastricht: Global Labor Organization (GLO), 2018
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Maastricht: Global Labor Organization (GLO), 2018
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Budapest: Hungarian Academy of Sciences, Institute of Economics, 2018
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Bonn: Institute for the Study of Labor (IZA), 2015
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Canterbury: University of Kent, School of Economics, 2015
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Munich: ifo Institute - Leibniz Institute for Economic Research at the University of Munich, 2013
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Louvain-la-Neuve: European Regional Science Association (ERSA), 2013
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Mering: Rainer Hampp Verlag, 2011
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Bonn: Institute for the Study of Labor (IZA), 2006
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Munich: ifo Institute - Leibniz Institute for Economic Research at the University of Munich, 2020
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Bonn: Institute for the Study of Labor (IZA), 2011
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Bonn: Institute for the Study of Labor (IZA), 2009