@article{ref1,
title="Heads up. Protect neck, head from serious football injuries",
journal="Texas medicine",
year="1967",
author="Collins, H. R. and Johnson, Charles",
volume="63",
number="11",
pages="40-41",
abstract="<p>[Abstract unavailable]  Keywords: American football; </p> <p>Language: en</p>",
language="en",
issn="0040-4470",
doi="",
url="http://dx.doi.org/"
}