@article{ref1,
title="Improvement of the protective effects of motorcycle helmets based on a mathematical study",
journal="Proceedings of the International Research Council on the Biomechanics of Injury conference",
year="1988",
author="Kostner, H. and Stocker, U.w.",
volume="16",
number="",
pages="195-213",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="2235-3151",
doi="",
url="http://dx.doi.org/"
}