@article{ref1,
title="Mouthguards: protection against shock to head, neck and teeth",
journal="Journal of the American Dental Association",
year="1964",
author="Stenger, J. M. and Lawson, E. A. and Wright, Justin M. and Ricketts, J.",
volume="69",
number="",
pages="273-281",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-8177",
doi="",
url="http://dx.doi.org/"
}