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Bonn: Institute for the Study of Labor (IZA), 2012
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Helsinki: The United Nations University World Institute for Development Economics Research (UNU-WIDER), 2008
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Amherst, MA: University of Massachusetts, Department of Economics, 2008
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Munich: Center for Economic Studies and ifo Institute (CESifo), 2004
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New Brunswick, NJ: Rutgers University, Department of Economics, 2003
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Copenhagen: University of Copenhagen, Economic Policy Research Unit (EPRU), 2003
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Bonn: Institute for the Study of Labor (IZA), 2003
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Bonn: University of Bonn, Center for Development Research (ZEF), 2001
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Kiel: Kiel Institute for the World Economy (IfW), 2012
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Göttingen: Georg-August-Universität Göttingen, Ibero-America Institute for Economic Research (IAI), 2012
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Bern: University of Bern, Department of Economics, 2010
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Jena: Friedrich Schiller University Jena and Max Planck Institute of Economics, 2009
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Bonn: Institute for the Study of Labor (IZA), 2008
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Bonn: Institute for the Study of Labor (IZA), 2008
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Kiel: Kiel Institute for the World Economy (IfW), 2006
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Helsinki: The United Nations University World Institute for Development Economics Research (UNU-WIDER), 2005
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Bonn: Institute for the Study of Labor (IZA), 2004
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Kiel: Kiel Institute for World Economics (IfW), 2003
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Bonn: Institute for the Study of Labor (IZA), 2000
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Munich: Center for Economic Studies and ifo Institute (CESifo), 2007