@article{ref1,
title="Gang violence in hospitals: how four hospitals are handling it",
journal="Hospital security and safety management",
year="1990",
author="",
volume="11",
number="8",
pages="1-3",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0745-1148",
doi="",
url="http://dx.doi.org/"
}