@article{ref1,
title="Urban flow: bike messengers and the city",
journal="Contemporary sociology",
year="2014",
author="Petty, Ross D.",
volume="43",
number="4",
pages="542-543",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0094-3061",
doi="10.1177/0094306114539455aa",
url="http://dx.doi.org/10.1177/0094306114539455aa"
}