@article{ref1,
title="Brain tolerance to impact in football",
journal="Surgery, gynecology and obstetrics",
year="1971",
author="Reid, S. E. and Tarkington, J. A. and Epstein, H. M. and O'Dea, T. J.",
volume="133",
number="6",
pages="929-936",
abstract="<p>[Abstract unavailable]  Keywords: American football </p> <p>Language: en</p>",
language="en",
issn="0039-6087",
doi="",
url="http://dx.doi.org/"
}