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Paris: European Conference of Ministers of Transport, 2002
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Bonn: Kirschbaum-Verl., 2001
Saxon Bibliography (Sächsische Bibliografie)
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Passau: L.I.S. Verl., 2000
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Berlin; Heidelberg [u.a.]: Springer, 2004
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Marburg/Lahn: Marburger Geographische Ges., 2001
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Berlin: DVWG, 2003
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Paris: OECD Publishing, 2023
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Cambridge, Mass: National Bureau of Economic Research, January 2023