@article{ref1,
title="Analysis of Census Data on Walking to Work and Working at Home",
journal="Transportation quarterly",
year="1990",
author="Black, Anne",
volume="44",
number="1",
pages="107-120",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0278-9434",
doi="",
url="http://dx.doi.org/"
}