@article{ref1,
title="Public transportation: advantages and challenges",
journal="Journal of urban health",
year="2005",
author="Gershon, Robyn R. M.",
volume="82",
number="1",
pages="7-9",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="1099-3460",
doi="10.1093/jurban/jti003",
url="http://dx.doi.org/10.1093/jurban/jti003"
}