@article{ref1,
title="Helmet laws and health",
journal="Injury prevention",
year="1998",
author="Robinson, Dwight and Acton, Caroline H.",
volume="4",
number="3",
pages="170-172",
abstract="Abstract unavailable.",
language="en",
issn="1353-8047",
doi="",
url="http://dx.doi.org/"
}