@article{ref1,
title="Unprotected road users--the most important category of road traffic casualties",
journal="Injury",
year="1976",
author="Hansson, P. G.",
volume="7",
number="4",
pages="306-309",
abstract="Abstract unavailable.",
language="",
issn="0020-1383",
doi="",
url="http://dx.doi.org/"
}