@article{ref1,
title="Improvement on (standard type) level crossing warning device through value engineering method /",
journal="Japanese railway engineering",
year="1994",
author="Shimizu, Hiromu",
volume="",
number="",
pages="-",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0448-8938",
doi="",
url="http://dx.doi.org/"
}