@article{ref1,
title="A new classification of narcotic addicts based on type and extent of criminal activity",
journal="Comprehensive psychiatry",
year="1984",
author="Shaffer, J. W. and Nurco, D. N. and Kinlock, T. W.",
volume="25",
number="3",
pages="315-328",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0010-440X",
doi="",
url="http://dx.doi.org/"
}