@article{ref1,
title="Alcohol and marijuana--social problem perspective",
journal="British journal of addiction to alcohol and other drugs",
year="1973",
author="Rockwell, D. A.",
volume="68",
number="3",
pages="209-214",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0007-0890",
doi="",
url="http://dx.doi.org/"
}