@article{ref1,
title="Single and multiple patterns of adolescent substance use: longitudinal comparisons of four ethnic groups",
journal="Journal of drug education",
year="1985",
author="Maddahian, E. and Newcomb, Michael D. and Bentler, P. M.",
volume="15",
number="4",
pages="311-326",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0047-2379",
doi="",
url="http://dx.doi.org/"
}