@article{ref1,
title="Medical student use of marijuana, alcohol, and cigarettes: a study of four schools",
journal="International journal of the addictions",
year="1972",
author="Lipp, M. and Tinklenberg, J. and Benson, S. and Melges, F. and Taintor, Z. and Peterson, M.",
volume="7",
number="1",
pages="141-152",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0020-773X",
doi="",
url="http://dx.doi.org/"
}