@article{ref1,
title="The economic control of urban transport demand",
journal="IATSS research",
year="1991",
author="Frybourg, M",
volume="15",
number="1",
pages="27-32",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0386-1112",
doi="",
url="http://dx.doi.org/"
}