@article{ref1,
title="Injury patterns and helmet effectiveness among hospitalized motorcyclists",
journal="Minnesota medicine",
year="1981",
author="Carr, W. P. and Brandt, D. and Swanson, K.",
volume="64",
number="9",
pages="521-527",
abstract="Abstract unavailable.",
language="",
issn="0026-556X",
doi="",
url="http://dx.doi.org/"
}