@article{ref1,
title="The association of accident severity and frequency with vehicle age : A study in three Michigan counties for the period 1 January to 30 September, 1966",
journal="Accident analysis and prevention",
year="1970",
author="Little, JW and Hall, William K.",
volume="2",
number="1",
pages="35-55",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0001-4575",
doi="",
url="http://dx.doi.org/"
}