@article{ref1,
title="Fighting and punishment from a developmental perspective",
journal="Nebraska symposium on motivation",
year="1972",
author="Cairns, R. B.",
volume="20",
number="",
pages="59-124",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0146-7875",
doi="",
url="http://dx.doi.org/"
}