@article{ref1,
title="Cannabis and schizophrenia",
journal="British journal of addiction",
year="1989",
author="Negrete, J. C.",
volume="84",
number="4",
pages="349-351",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0952-0481",
doi="",
url="http://dx.doi.org/"
}