@article{ref1,
title="Human violence: A biological perspective",
journal="Criminal behaviour and mental health",
year="1991",
author="Gunn, John",
volume="1",
number="1",
pages="34-54",
abstract="[Abstract unavailable]  <p>Language: en</p>",
language="en",
issn="0957-9664",
doi="",
url="http://dx.doi.org/"
}