@article{ref1,
title="How many forms of aggression in humans?",
journal="Aggressive behavior",
year="1993",
author="Caprara, Gian Vittorio",
volume="19",
number="1",
pages="3-3",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0096-140X",
doi="",
url="http://dx.doi.org/"
}