@article{ref1,
title="Multiple drug use of marihuana users",
journal="Diseases of the nervous system",
year="1973",
author="Fisher, G. and Brickman, H. R.",
volume="34",
number="1",
pages="40-43",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0012-3714",
doi="",
url="http://dx.doi.org/"
}