@article{ref1,
title="A comparison of five techniques of measuring road accident experience",
journal="Journal of safety research",
year="1971",
author="Greenberg, L.",
volume="3",
number="4",
pages="167-175",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0022-4375",
doi="",
url="http://dx.doi.org/"
}