@article{ref1,
title="Commonly utilised road traffic accident indicators",
journal="Accident analysis and prevention",
year="1987",
author="Andreassen, D. C.",
volume="19",
number="2",
pages="147-148",
abstract="Abstract unavailable.",
language="en",
issn="0001-4575",
doi="",
url="http://dx.doi.org/"
}