@article{ref1,
title="Advancing knowledge on cannabis policy using evidence from North America",
journal="International journal on drug policy",
year="2017",
author="Stevens, Alex and Pacula, Rosalie Liccardo",
volume="42",
number="",
pages="36-38",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0955-3959",
doi="10.1016/j.drugpo.2017.02.004",
url="http://dx.doi.org/10.1016/j.drugpo.2017.02.004"
}