@article{ref1,
title="Commentary: next steps for graduated licensing",
journal="Traffic injury prevention",
year="2005",
author="Williams, Allan F.",
volume="6",
number="3",
pages="199-201",
abstract="Abstract unavailable.",
language="",
issn="1538-9588",
doi="10.1080/15389580590969076",
url="http://dx.doi.org/10.1080/15389580590969076"
}