@article{ref1,
title="Protection of the head and face",
journal="Dental clinics of North America",
year="1982",
author="Tompson, B. D.",
volume="26",
number="3",
pages="659-667",
abstract="Abstract unavailable.",
language="",
issn="0011-8532",
doi="",
url="http://dx.doi.org/"
}