@article{ref1,
title="Gender segregation in childhood",
journal="Advances in child development and behavior",
year="1987",
author="Maccoby, E. E. and Jacklin, C. N.",
volume="20",
number="",
pages="239-287",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0065-2407",
doi="",
url="http://dx.doi.org/"
}