@article{ref1,
title="Mouthguards: protection against shock to head, neck and teeth",
journal="Basal facts",
year="1987",
author="Stenger, J. M. and Lawton, E. A. and Wright, J. M. and Ricketts, J.",
volume="9",
number="4",
pages="133-139",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0147-9679",
doi="",
url="http://dx.doi.org/"
}