@article{ref1,
title="Riot-control agents",
journal="British medical journal: BMJ",
year="1969",
author="",
volume="3",
number="5670",
pages="546-546",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0959-8138",
doi="",
url="http://dx.doi.org/"
}