@article{ref1,
title="Amphetamine and other non-opioid drug users attending a special drug dependence clinic",
journal="British medical journal: BMJ",
year="1972",
author="Gardner, R. and Connell, P. H.",
volume="2",
number="5809",
pages="322-325",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0959-8138",
doi="",
url="http://dx.doi.org/"
}