@article{ref1,
title="Introduction: exploring the substance abuse-violence connection",
journal="NIDA research monograph",
year="1990",
author="De la Rosa, M. and Lambert, E. Y. and Gropper, B.",
volume="103",
number="",
pages="1-7",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="1046-9516",
doi="",
url="http://dx.doi.org/"
}