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Geneva: IRU, [1998]
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Geneva, 1962
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Basel: European Center to Economic Research and Strategy Consulting, Prognos, 2000
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Giessen: Univ., 1993
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Giessen, 1993
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Köln: Dt. Verkehrswiss. Ges. e. V., DVWG, [1973]
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International Finance Corporation, Washington, DC
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International Finance Corporation, Washington, DC
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SAGE Publications, 1986
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Oxford University Press (OUP), 1999