@article{ref1,
title="A comparison of marijuana users and non-users",
journal="Nature",
year="1970",
author="Zinberg, N. E. and Weil, A. T.",
volume="226",
number="5241",
pages="119-123",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0028-0836",
doi="",
url="http://dx.doi.org/"
}