@article{ref1,
title="Sex differences in emotional behaviour in mammals including man: endocrine bases",
journal="Acta psychologica",
year="1971",
author="Gray, J. A.",
volume="35",
number="1",
pages="29-46",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-6918",
doi="",
url="http://dx.doi.org/"
}