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Brussels: European Commission, Directorate-General for Economic and Financial Affairs, 2002
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Brussels: Office for Infrastructures and Logistics, 2008
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Kiel: Inst. für Weltwirtschaft, 1999
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Brussels: Europ. Comm., Directorate-General for Economic and Financial Affairs, 2013
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München: ifo Institut für Wirtschaftsforschung, [2002]
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Ann Arbor, Michigan: Research Seminar in International Economics, Gerald R. Ford School of Public Policy, the University of Michigan, June 2014
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Munich: Center for Economic Studies and Ifo Institute (CESifo), 2003