@article{ref1,
title="Perimenstrual aggression in groups of female rhesus monkeys",
journal="Journal of reproduction and fertility",
year="1973",
author="Sassenrath, E. N. and Rowell, Thelma E. and Hendrickx, A. G.",
volume="34",
number="3",
pages="509-511",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-4251",
doi="",
url="http://dx.doi.org/"
}