@article{ref1,
title="Proper playing conditions",
journal="Journal of sports medicine",
year="1974",
author="Hirata, I.",
volume="2",
number="4",
pages="228-234",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0090-4201",
doi="",
url="http://dx.doi.org/"
}