American Society of Civil Engineers, Journal of Transportation Engineering, 3(135), p. 150-152, 2009
DOI: 10.1061/(asce)0733-947x(2009)135:3(150)
American Society of Civil Engineers, Journal of Transportation Engineering, 3(135), p. 151
DOI: 10.1061/(asce)0733-947x(2009)135:3(151)
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