@article{ref1,
title="Human aggressive behaviour: the period of perpetration in relation to month of birth of male offenders",
journal="Journal of biosocial science",
year="1977",
author="Kop, P. P.",
volume="9",
number="3",
pages="309-316",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0021-9320",
doi="",
url="http://dx.doi.org/"
}