@article{ref1,
title="Methadone in Tang",
journal="Annals of internal medicine",
year="1973",
author="Smith, Anthony M. A. and Dratch, M. B. and Mintz, S. S.",
volume="78",
number="1",
pages="154-155",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0003-4819",
doi="",
url="http://dx.doi.org/"
}