@article{ref1,
title="North Carolina high school football injury study: equipment and prevention",
journal="Journal of sports medicine",
year="1974",
author="Mueller, F. O. and Blyth, C. S.",
volume="2",
number="1",
pages="1-10",
abstract="unavailable.   Keywords: American football;",
language="en",
issn="0090-4201",
doi="",
url="http://dx.doi.org/"
}