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Berlin: Bundesministerium der Finanzen, 2000
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Brussels: Office for Intrastructures and Logistics in Brussels, 2009
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Brussels: European Commission, Directorate General for Economic and Financial Affairs, 2001
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Köln: Universitäts- und Stadtbibliothek Köln, 2011
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[S.l.]: SSRN, [2019]
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Colchester: University of Essex, Institute for Social and Economic Research (ISER), 2006
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Bonn: Institute for the Study of Labor (IZA), 2006
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Bonn: Institute of Labor Economics (IZA), 2020
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Helsinki, Finland: United Nations University World Institute for Development Economics Research, November 2022
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Essen: Global Labor Organization (GLO), 2021
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Seville: European Commission, Joint Research Centre (JRC), 2021
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Seville: European Commission, 2021
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Essen: Global Labor Organization (GLO), 2021
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Kiel, Hamburg: ZBW - Leibniz-Informationszentrum Wirtschaft, 2019
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Helsinki: The United Nations University World Institute for Development Economics Research (UNU-WIDER), 2018
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Colchester: University of Essex, Institute for Social and Economic Research (ISER), 2014
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Heidelberg: Springer, 2014
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Berlin: Duncker & Humblot, 2013