@article{ref1,
title="Correlations between road traffic and the size of cities",
journal="Traffic quarterly",
year="1948",
author="Schlums, J.",
volume="2",
number="3",
pages="219-238",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0041-0713",
doi="",
url="http://dx.doi.org/"
}