@article{ref1,
title="Two simple techniques for determning the significance of accident-reducing measures",
journal="Traffic safety research review",
year="1960",
author="Michaels, RM",
volume="4",
number="2",
pages="16-17",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0564-0741",
doi="",
url="http://dx.doi.org/"
}