@article{ref1,
title="Methodological issues in the measurement of substance use",
journal="Annals of the New York Academy of Sciences",
year="1989",
author="Day, Nancy L. and Robles, N.",
volume="562",
number="",
pages="8-13",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0077-8923",
doi="",
url="http://dx.doi.org/"
}