@article{ref1,
title="Stratifying marijuana use groups",
journal="Journal of studies on alcohol",
year="2000",
author="Voth, Eric A.",
volume="61",
number="6",
pages="920-920",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0096-882X",
doi="",
url="http://dx.doi.org/"
}