By Wong K.I.   Wong S.C.   Yang H.   in Transportation Research Part B: Methodological

ISSN:0191-2615|35|9|819-842

Elsevier‎(2001)‎

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By Yuen C.W.   Wong K.I.   Han Anthony F.   in International Journal of Environment and Sustainable Development

ISSN:1474-6778|8|3-4|314-329

Inderscience Publishers‎(2009)‎

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