@article{ref1,
title="Young men and drugs in Manhattan: a causal analysis",
journal="NIDA research monograph",
year="1981",
author="Clayton, Richard R. and Voss, H. L.",
volume="39",
number="",
pages="1-187",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="1046-9516",
doi="",
url="http://dx.doi.org/"
}