@article{ref1,
title="A comparative study of drug addicts over and under 30 years of age",
journal="Tidsskrift for den Norske Laegeforening",
year="1975",
author="Stang, J. and Gravem, A. and Wesenberg, M. and Jorgensen, D.",
volume="95",
number="3",
pages="163-170",
abstract="<p>[Abstract unavailable]</p><p>Language: no</p>",
language="no",
issn="0029-2001",
doi="",
url="http://dx.doi.org/"
}