@article{ref1,
title="A nine-year study of football-incurred knee injuries at Harvard, testing the validity of the Hanley heel concept",
journal="Journal of the American College Health Association",
year="1970",
author="Gibbs, R. W.",
volume="18",
number="5",
pages="345-346",
abstract="<p>[Abstract unavailable]  Keywords: American football </p> <p>Language: en</p>",
language="en",
issn="0002-7944",
doi="",
url="http://dx.doi.org/"
}