@article{ref1,
title="Bicycling in the United States: A fringe mode?",
journal="Transportation quarterly",
year="1998",
author="Gordon, Peter and Richardson, Harry W.",
volume="52",
number="1",
pages="9-11",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0278-9434",
doi="",
url="http://dx.doi.org/"
}