@article{ref1,
title="The Effectiveness of Present-Day Crash Helmets for Motorcyclists",
journal="OR: Operational research quarterly (1953)",
year="1957",
author="Chandler, K. N. and Thompson, J. K. L.",
volume="8",
number="2",
pages="63-71",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="1473-2858",
doi="10.2307/3006840",
url="http://dx.doi.org/10.2307/3006840"
}