@article{ref1,
title="Participation in sports by girls",
journal="Pediatrics",
year="1975",
author="",
volume="55",
number="4",
pages="563-563",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0031-4005",
doi="",
url="http://dx.doi.org/"
}