@article{ref1,
title="A macroscopic risk assessment method for railway systems",
journal="IATSS research",
year="1997",
author="Shimaura, M and Horiuchi, M and Fukuyama, H",
volume="21",
number="2",
pages="126-133",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0386-1112",
doi="",
url="http://dx.doi.org/"
}