@article{ref1,
title="Physical effects of the penetration of head simulants by steel spheres",
journal="Journal of trauma",
year="1988",
author="Stainer, M. C. and Pearce, B. P. and Watkins, F. P.",
volume="28",
number="1 Suppl",
pages="S40-54",
abstract="Abstract unavailable.",
language="",
issn="0022-5282",
doi="",
url="http://dx.doi.org/"
}