@article{ref1,
title="Standardization of Colors for Traffic Signals",
journal="Journal of the Optical Society of America and review of scientific instruments",
year="1925",
author="No Author(s) Listed, ",
volume="11",
number="5",
pages="471-472",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0093-4119",
doi="",
url="http://dx.doi.org/"
}