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Napoli: CUEN, 1998
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Opladen: Leske + Budrich, 2001
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Verona: Cierre, 1997
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Cambridge, Mass. [u.a.]: Harvard Univ. Press, 2001
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München: Hanns-Seidel-Stiftung, Acad. for Politics and Current Affairs, 2002
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Stanford, Calif.: Stanford Univ. Press, 1994
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Cambridge, Mass: National Bureau of Economic Research, April 2022
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Bonn: Institute for the Study of Labor (IZA), 2008
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Berlin: Deutsches Institut für Wirtschaftsforschung (DIW), 2008
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München: Hanns-Seidel-Stiftung, Acad. for Politics and Current Affairs, 2002