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Cambridge, Mass. [u.a.]: MIT Press, 1999
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London: Centre for Economic Policy Research, 1993
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London: Centre for Economic Policy Research, 1992
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Cambridge [u.a.]: Cambridge University Press, 2000
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Princeton, NJ [u.a.]: Princeton Univ. Press, 2004
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London: Centre for Economic Policy Research, 1995
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London: Centre for Economic Policy Research, 1993
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London: Centre for Economic Policy Research, 1993
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Cambridge, Mass. New York, N.Y. Port Chester: Cambridge Univ. Pr., 1991
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Cambridge, Mass. [u.a.]: MIT Press, 2001
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Cambridge, Mass. [u.a.]: MIT Press, 2000
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Cheltenham: Edward Elgar Pub. Ltd, 2015
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Cambridge, Mass: National Bureau of Economic Research, December 2010
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Cambridge, Mass: National Bureau of Economic Research, February 2008
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Cambridge, Mass: National Bureau of Economic Research, December 1993
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London: Centre for Economic Performance, London School of Economics and Political Science, [2020]
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Oxford: Department of Economics, University of Oxford, [2020]
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Louvain-la-Neuve: European Regional Science Association (ERSA), 2018
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Paris: International Transport Forum, February 2016
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Paris: Organisation for Economic Co-operation and Development (OECD), International Transport Forum, 2016