@article{ref1,
title="Polydrug abuse or multidrug misuse: it's here to stay",
journal="British journal of addiction to alcohol and other drugs",
year="1977",
author="Kaufman, E.",
volume="72",
number="4",
pages="339-347",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0007-0890",
doi="",
url="http://dx.doi.org/"
}