@article{ref1,
title="Evaluation of drug abuse",
journal="American family physician",
year="1972",
author="Horowitz, R. N. and North, R.",
volume="6",
number="4",
pages="112-115",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-838X",
doi="",
url="http://dx.doi.org/"
}