@article{ref1,
title="Defining aggression",
journal="Perspectives in psychiatric care",
year="1996",
author="Valentine, C.",
volume="32",
number="2",
pages="30-31",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0031-5990",
doi="",
url="http://dx.doi.org/"
}