@article{ref1,
title="Head trauma--a parametric dynamic study",
journal="Journal of biomechanics",
year="1969",
author="Roberts, S. B. and Ward, Chris C. and Nahum, A. M.",
volume="2",
number="4",
pages="397-415",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0021-9290",
doi="",
url="http://dx.doi.org/"
}