@article{ref1,
title="Violent behavior among Colombian adolescents",
journal="American journal of psychiatry",
year="2004",
author="Vaughn, Michael G.",
volume="161",
number="5",
pages="931; author reply 931-2",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-953X",
doi="",
url="http://dx.doi.org/"
}