@article{ref1,
title="Economic evaluation of urban transport projects: the state of the art",
journal="Transportation planning and technology",
year="1972",
author="Gwilliam, K. M.",
volume="1",
number="2",
pages="123-142",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0308-1060",
doi="10.1080/03081067208717039",
url="http://dx.doi.org/10.1080/03081067208717039"
}