@article{ref1,
title="National football league",
journal="Journal of safety research",
year="2012",
author="Guste, Angelique",
volume="43",
number="4",
pages="309-309",
abstract="<p>[Abstract unavailable]  Keywords: American football </p> <p>Language: en</p>",
language="en",
issn="0022-4375",
doi="10.1016/j.jsr.2012.08.010",
url="http://dx.doi.org/10.1016/j.jsr.2012.08.010"
}