@article{ref1,
title="Custom mouthguards increase may increase player strength",
journal="Dentistry today",
year="1992",
author="Witzig, J.",
volume="11",
number="5",
pages="32-33",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="8750-2186",
doi="",
url="http://dx.doi.org/"
}