@article{ref1,
title="The Relationships Between City Size and Traffic",
journal="Zeitschrift des Vereines Deutscher Ingenieure",
year="1921",
author="Hannover, B",
volume="65",
number="",
pages="285-288",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0341-7255",
doi="",
url="http://dx.doi.org/"
}