@article{ref1,
title="Indices of accident clustering: a re-evaluation",
journal="Traffic engineering and control",
year="1995",
author="Nicholson, A.",
volume="36",
number="5",
pages="291-",
abstract="[Abstract unavailable]  <p>Language: en</p>",
language="en",
issn="0041-0683",
doi="",
url="http://dx.doi.org/"
}