@article{ref1,
title="Offensive and defensive aggression in humans: a longitudinal perspective",
journal="Aggressive behavior",
year="1987",
author="Pulkkinen, Lea",
volume="13",
number="4",
pages="197-212",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0096-140X",
doi="",
url="http://dx.doi.org/"
}