@article{ref1,
title="Causes of death among institutionalized narcotic addicts",
journal="Journal of chronic diseases",
year="1970",
author="Sapira, J. D. and Ball, J. C. and Penn, H.",
volume="22",
number="11",
pages="733-742",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0021-9681",
doi="",
url="http://dx.doi.org/"
}