@article{ref1,
title="Are cannabis substances dangerous?",
journal="Tidsskrift for den Norske Laegeforening",
year="1973",
author="Retterstol, N.",
volume="93",
number="25",
pages="1754-1757",
abstract="<p>[Abstract unavailable]</p><p>Language: no</p>",
language="no",
issn="0029-2001",
doi="",
url="http://dx.doi.org/"
}