@article{ref1,
title="Research agendas in transport geography for the 1990s",
journal="Journal of transport geography",
year="1993",
author="Knowles, Richard D.",
volume="1",
number="1",
pages="3-11",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0966-6923",
doi="10.1016/0966-6923(93)90033-V",
url="http://dx.doi.org/10.1016/0966-6923(93)90033-V"
}