@article{ref1,
title="A comparison of custom vs. standard mouth guards. A preliminary study",
journal="New York state dental journal",
year="1989",
author="Bass, E. H. and Williams, F. A.",
volume="55",
number="9",
pages="74-76",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0028-7571",
doi="",
url="http://dx.doi.org/"
}