@article{ref1,
title="Survey of adolescent drug use. 3. Correlations among use of drugs",
journal="American journal of public health",
year="1972",
author="Weitman, M. and Scheble, R. and Johnson, K. G. and Abbey, H.",
volume="62",
number="2",
pages="166-170",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0090-0036",
doi="",
url="http://dx.doi.org/"
}