@article{ref1,
title="Violence and man's struggle to adapt",
journal="Science",
year="1969",
author="Gilula, M. F. and Daniels, D. N.",
volume="164",
number="878",
pages="396-405",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0036-8075",
doi="",
url="http://dx.doi.org/"
}