@article{ref1,
title="Pre-treatment natural history of cocaine addiction",
journal="NIDA research monograph",
year="1990",
author="Khalsa, H. K. and Anglin, M. D. and Paredes, A.",
volume="105",
number="",
pages="494-500",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="1046-9516",
doi="",
url="http://dx.doi.org/"
}