@article{ref1,
title="Demand management for urban road traffic in the United Kingdom -- towards a sustainable transport policy for urban areas",
journal="IATSS research",
year="1991",
author="May, Anthony D. and Roberts, Marion",
volume="15",
number="1",
pages="14-26",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0386-1112",
doi="",
url="http://dx.doi.org/"
}