@article{ref1,
title="Styles of aggression and sex differences: A developmental theory",
journal="Aggressive behavior",
year="1993",
author="Bjorkqvist, Kaj and Lagerspetz, KMJ and Osterman, Karin and Kaukiainen, Ari",
volume="19",
number="1",
pages="11-12",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0096-140X",
doi="",
url="http://dx.doi.org/"
}