@article{ref1,
title="Protection afforded by cycle helmets",
journal="British medical journal: BMJ",
year="1994",
author="Keatinge, R. and Parry, R.",
volume="309",
number="6966",
pages="1441-1441",
abstract="Abstract unavailable.",
language="",
issn="0959-8138",
doi="",
url="http://dx.doi.org/"
}