@article{ref1,
title="Cycle helmets",
journal="British medical journal: BMJ",
year="1992",
author="Whitelegg, J. and Davis, R.",
volume="305",
number="6867",
pages="1504-1504",
abstract="Abstract unavailable.",
language="",
issn="0959-8138",
doi="",
url="http://dx.doi.org/"
}