@article{ref1,
title="Changing patterns of homicide in New York City",
journal="New York state journal of medicine",
year="1972",
author="Helpern, M. and Devlin, J. F. and Ehrenreich, T.",
volume="72",
number="17",
pages="2154-2157",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0028-7628",
doi="",
url="http://dx.doi.org/"
}