@article{ref1,
title="Helmet laws and cycle use",
journal="Injury prevention",
year="2003",
author="Robinson, D. L.",
volume="9",
number="4",
pages="380; author reply 380-1",
abstract="Abstract unavailable.",
language="en",
issn="1353-8047",
doi="",
url="http://dx.doi.org/"
}