@article{ref1,
title="Violence prevention in Philadelphia",
journal="Pennsylvania medicine",
year="1993",
author="Ross, R. K.",
volume="96",
number="9",
pages="50-51",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0031-4595",
doi="",
url="http://dx.doi.org/"
}