@article{ref1,
title="Violence among attenders at a London drug clinic",
journal="British journal of psychiatry",
year="1973",
author="Blumberg, H. H.",
volume="122",
number="570",
pages="619-619",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0007-1250",
doi="",
url="http://dx.doi.org/"
}