@article{ref1,
title="On the effect of removing persons with N or more accidents from an accident prone population",
journal="Biometrika",
year="1965",
author="Haight, Frank A.",
volume="52",
number="1-2",
pages="298-300",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0006-3444",
doi="10.1093/biomet/52.1-2.298",
url="http://dx.doi.org/10.1093/biomet/52.1-2.298"
}