@article{ref1,
title="Severe quadriceps muscle contusions in athletes",
journal="American journal of sports medicine",
year="2004",
author="Cooper, Daniel E.",
volume="32",
number="3",
pages="820; author reply 820-1",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0363-5465",
doi="",
url="http://dx.doi.org/"
}