@article{ref1,
title="Thinking about cohorts",
journal="Journal of criminal law and criminology",
year="1991",
author="Wilson, JQ",
volume="82",
number="1",
pages="119-124",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0091-4169",
doi="",
url="http://dx.doi.org/"
}