@article{ref1,
title="Homicide in the United States",
journal="Vital and health statistics, Series 20",
year="1967",
author="Langberg, R.",
volume="1967",
number="6",
pages="1-33",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0083-2022",
doi="",
url="http://dx.doi.org/"
}