@article{ref1,
title="Helmet optimization: outer and inner shell behavior with respect to various criteria",
journal="International journal for consumer safety",
year="1995",
author="Beusenberg, Marc C. and Happee, Riender",
volume="2",
number="3",
pages="149-162",
abstract="Abstract unavailable.<p />",
language="",
issn="0929-8347",
doi="",
url="http://dx.doi.org/"
}