@article{ref1,
title="Human conflict: Pacifists at heart",
journal="Science",
year="2012",
author="Lieberman, E.J.",
volume="337",
number="6092",
pages="290-291",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0036-8075",
doi="10.1126/science.337.6092.290-c",
url="http://dx.doi.org/10.1126/science.337.6092.290-c"
}