@article{ref1,
title="Aggressive and non-aggressive fighting in twelve-to-thirteen year old pre-adolescent boys",
journal="Journal of child psychology and psychiatry",
year="1976",
author="Neill, S. R.",
volume="17",
number="3",
pages="213-220",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0021-9630",
doi="",
url="http://dx.doi.org/"
}