@article{ref1,
title="More research is needed into the effects on injury of substitute and interchange rules in team sports",
journal="British journal of sports medicine",
year="2012",
author="Orchard, John",
volume="46",
number="10",
pages="694-695",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0306-3674",
doi="10.1136/bjsports-2011-090470",
url="http://dx.doi.org/10.1136/bjsports-2011-090470"
}