@article{ref1,
title="Operation analysis of traffic safety, part IV",
journal="Traffic safety research review",
year="1960",
author="Platt, F. N.",
volume="4",
number="4",
pages="4-7",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0564-0741",
doi="",
url="http://dx.doi.org/"
}