@article{ref1,
title="The crime drop in America",
journal="Journal of criminal law and criminology",
year="2000",
author="Lafree, G.",
volume="91",
number="1",
pages="269-305",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0091-4169",
doi="",
url="http://dx.doi.org/"
}