@article{ref1,
title="For three quarters of century, safety experts work to keep trains, vehicles from colliding",
journal="JAMA journal of the American Medical Association",
year="1992",
author="Gunby, P.",
volume="268",
number="3",
pages="302-303",
abstract="Abstract unavailable.",
language="",
issn="0098-7484",
doi="",
url="http://dx.doi.org/"
}