@article{ref1,
title="Difficulties in estimating air bag effectiveness",
journal="Accident analysis and prevention",
year="2001",
author="Cummings, P.",
volume="33",
number="1",
pages="145-146",
abstract="Abstract unavailable.",
language="en",
issn="0001-4575",
doi="",
url="http://dx.doi.org/"
}