@article{ref1,
title="Physician use of marijuana, alcohol, and tobacco",
journal="American journal of psychiatry",
year="1972",
author="Lipp, M. R. and Benson, S. G.",
volume="129",
number="5",
pages="612-616",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-953X",
doi="",
url="http://dx.doi.org/"
}