@article{ref1,
title="Football players' opinions of mouthguards",
journal="Journal of the American Dental Association",
year="1965",
author="Nachman, B. M. and Smith, J. F. and Richardson, F. S.",
volume="70",
number="",
pages="62-69",
abstract="<p>[Abstract unavailable]  Keywords: American football; </p> <p>Language: en</p>",
language="en",
issn="0002-8177",
doi="",
url="http://dx.doi.org/"
}