@article{ref1,
title="Research on patient classification for drug users in the DARP",
journal="American journal of drug and alcohol abuse encompassing all addictive disorders",
year="1975",
author="Joe, G. W. and Simpson, D. D.",
volume="2",
number="1",
pages="29-35",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0095-2990",
doi="",
url="http://dx.doi.org/"
}