@article{ref1,
title="Head injuries, helmets, cycle lanes, and cyclists",
journal="British medical journal (clinical research edition)",
year="1988",
author="Simpson, A. Hamish and Unwin, P. S. and Nelson, I. W.",
volume="296",
number="6630",
pages="1161-1162",
abstract="Abstract unavailable.",
language="",
issn="0267-0623",
doi="",
url="http://dx.doi.org/"
}