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1منشور في 1990“...PTRC Education and Research Services Ltd. on behalf of the Planning and Transport Research and Computation International Association,...”
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2منشور في 1991“...PTRC Education and Research Services Ltd. on behalf of the Planning and Transport Research and Computation International Association,...”
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3منشور في 1989“...PTRC Education and Research Services Ltd. on behalf of the Planning and Transport Research and Computation International Association,...”
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