@article{ref1,
title="The roots of violence",
journal="British medical journal: BMJ",
year="1989",
author="",
volume="298",
number="6665",
pages="46-47",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0959-8138",
doi="",
url="http://dx.doi.org/"
}