@article{ref1,
title="Sex differences in passion and play",
journal="Perspectives in biology and medicine",
year="1974",
author="Harlow, H. F. and Lauersdorf, H. E.",
volume="17",
number="3",
pages="348-360",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0031-5982",
doi="",
url="http://dx.doi.org/"
}