@article{ref1,
title="New football rules and athletic injuries",
journal="Journal of the arkansas medical society",
year="1977",
author="Arnold, J. A. and Coker, T. P.",
volume="74",
number="4",
pages="163-165",
abstract="<p>[Abstract unavailable]  Keywords: American football  </p> <p>Language: en</p>",
language="en",
issn="0004-1858",
doi="",
url="http://dx.doi.org/"
}