@article{ref1,
title="Use of marijuana and other drugs among adult marijuana users: a longitudinal study",
journal="Comprehensive psychiatry",
year="1984",
author="Halikas, J. A. and Weller, R. A. and Morse, C. L. and Hoffmann, R. G.",
volume="25",
number="1",
pages="63-70",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0010-440X",
doi="",
url="http://dx.doi.org/"
}