@article{ref1,
title="Traffic signals and road signs in Europe in 1968",
journal="Ganka",
year="1969",
author="Fukami, K. and Ichikawa, H.",
volume="11",
number="11",
pages="939-948",
abstract="<p>[Abstract unavailable]</p> <p>Language: ja</p>",
language="ja",
issn="0016-4488",
doi="",
url="http://dx.doi.org/"
}