@article{ref1,
title="The effectiveness of impact attenuators: Two case studies in Massachusetts",
journal="Accident analysis and prevention",
year="1973",
author="Fitzgerald, EJ",
volume="5",
number="3",
pages="243-245",
abstract="An investigation of all collisions experienced over a 2-yr period of two crash cushion modules revealed a benefit/cost ratio greater than 2.4.<p />",
language="en",
issn="0001-4575",
doi="",
url="http://dx.doi.org/"
}