@article{ref1,
title="Protective capability of bicycle helmets",
journal="British journal of sports medicine",
year="1990",
author="Mills, N. J.",
volume="24",
number="1",
pages="55-60",
abstract="Cycle helmets that meet UK and US standards have been tested. The mechanisms of energy absorption for frontal and side impacts have been analysed. A good helmet should protect the wearer for impacts up to 15 mph into a rigid flat surface.",
language="",
issn="0306-3674",
doi="",
url="http://dx.doi.org/"
}