@article{ref1,
title="Mouth protectors: evaluation of eleven types",
journal="Journal of the American Dental Association",
year="1963",
author="Stevens, O. O.",
volume="67",
number="",
pages="521-528",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-8177",
doi="",
url="http://dx.doi.org/"
}