European Conference of Ministers of Transport, ProQuest (Firm), & International Symposium on Theory and Practice in Transport Economics. (2005). 50 years of transport research: Experience gained and major challenges ahead : 16th International Symposium on Theory and Practice in Transport Economics : Budapest, 29-31 October 2003 : introductory reports and summary of discussions. European Conference of Ministers of Transport.
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European Conference of Ministers of Transport, ProQuest (Firm), و International Symposium on Theory and Practice in Transport Economics. 50 Years of Transport Research: Experience Gained and Major Challenges Ahead : 16th International Symposium on Theory and Practice in Transport Economics : Budapest, 29-31 October 2003 : Introductory Reports and Summary of Discussions. Paris: European Conference of Ministers of Transport, 2005.
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European Conference of Ministers of Transport, et al. 50 Years of Transport Research: Experience Gained and Major Challenges Ahead : 16th International Symposium on Theory and Practice in Transport Economics : Budapest, 29-31 October 2003 : Introductory Reports and Summary of Discussions. European Conference of Ministers of Transport, 2005.
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تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.