@article{ref1,
title="Patterns of drug usage among university students. V. Heavy use of marihuana and alcohol by undergraduates",
journal="Journal of the American College Health Association",
year="1973",
author="Milman, D. H. and Su, W. H.",
volume="21",
number="3",
pages="181-187",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-7944",
doi="",
url="http://dx.doi.org/"
}