@article{ref1,
title="Psychiatric patients less violent when smoking restricted",
journal="British medical journal: BMJ",
year="2008",
author="Hitchen, Lisa",
volume="337",
number="",
pages="a735-a735",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0959-8138",
doi="10.1136/bmj.a735",
url="http://dx.doi.org/10.1136/bmj.a735"
}