@article{ref1,
title="Hitting, hurting, and having fun: Why violence is essential to life and different from aggression",
journal="Aggressive behavior",
year="2001",
author="Boyanowsky, Ehor O.",
volume="27",
number="3",
pages="210-210",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0096-140X",
doi="",
url="http://dx.doi.org/"
}