@article{ref1,
title="Mental health in first grade and teenage drug, alcohol, and cigarette use",
journal="Drug and alcohol dependence",
year="1980",
author="Kellam, S. G. and Ensminger, M. E. and Simon, M. B.",
volume="5",
number="4",
pages="273-304",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0376-8716",
doi="",
url="http://dx.doi.org/"
}