@article{ref1,
title="Improving research on drug law enforcement",
journal="International journal on drug policy",
year="2017",
author="Caulkins, Jonathan P.",
volume="41",
number="",
pages="158-159",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0955-3959",
doi="10.1016/j.drugpo.2017.01.002",
url="http://dx.doi.org/10.1016/j.drugpo.2017.01.002"
}