@article{ref1,
title="Injury associated with wearing a crash helment incorporating facial protection",
journal="British journal of oral surgery",
year="1976",
author="Yates, C.",
volume="14",
number="2",
pages="163-164",
abstract="Abstract unavailable.",
language="",
issn="0007-117X",
doi="",
url="http://dx.doi.org/"
}