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1دورية
المؤلفون: Kristjánsdóttir, Ólöf, Muench, Stephen, Michael, Larry, Burke, Gloria
المصدر: Transportation Research Record; December 2007, Vol. 2040 Issue: 0 p91-99, 9p
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2دورية
المصدر: Transportation Research Record; January 2007, Vol. 2040 Issue: 1 p91-99, 9p