@article{ref1,
title="Control of violence in a mental health setting",
journal="American journal of nursing",
year="1975",
author="Penningroth, P. E.",
volume="75",
number="4",
pages="606-609",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0002-936X",
doi="",
url="http://dx.doi.org/"
}