@article{ref1,
title="Variances of regression estimates of expected accident frequencies",
journal="Accident analysis and prevention",
year="1969",
author="Allsop, Richard E.",
volume="1",
number="3",
pages="245-252",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0001-4575",
doi="",
url="http://dx.doi.org/"
}