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Brussels: Office for Infrastructures and Logistics, 2008
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[S.l.]: SSRN, [2021]
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[S.l.]: SSRN, [2021]
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[S.l.]: SSRN, [2021]
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[S.l.]: SSRN, [2021]
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[S.l.]: SSRN, [2013]
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[S.l.]: SSRN, [2011]
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Bonn: Institute for the Study of Labor (IZA), 2011
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[S.l.]: SSRN, 2007
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Bonn: Institute for the Study of Labor (IZA), 2006
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Bonn: Institute for the Study of Labor (IZA), 2002
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Bonn: Institute for the Study of Labor (IZA), 2002
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Bonn: Institute for the Study of Labor (IZA), 2002
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Bonn: Institute for the Study of Labor (IZA), 2001
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Bonn: Institute for the Study of Labor (IZA), 2001
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[S.l.]: SSRN, [2017]
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[S.l.]: SSRN, [2016]
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[S.l.]: SSRN, [2015]