@article{ref1,
title="Multiple drug-use patterns among a group of high school students: regular users vs. nonusers of specific drug types",
journal="Journal of school health",
year="1976",
author="Seffrin, J. R. and Seehafer, R. W.",
volume="46",
number="7",
pages="413-416",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-4391",
doi="",
url="http://dx.doi.org/"
}