@article{ref1,
title="A historical note on U.S. railroad train collisions",
journal="Accident analysis and prevention",
year="1971",
author="Jones, RDH",
volume="3",
number="4",
pages="277-279",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0001-4575",
doi="",
url="http://dx.doi.org/"
}