@article{ref1,
title="A Norwegian Twin Study of Criminality",
journal="British journal of criminology",
year="1976",
author="Dalgard, Odd Steffen and Kringlen, E.",
volume="16",
number="3",
pages="213-232",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0007-0955",
doi="",
url="http://dx.doi.org/"
}