@article{ref1,
title="Prevention and mitigation of head injury from antiquity to the present",
journal="Journal of trauma",
year="1973",
author="Gurdjian, Elisha S.",
volume="13",
number="11",
pages="931-945",
abstract="Abstract unavailable.",
language="",
issn="0022-5282",
doi="",
url="http://dx.doi.org/"
}