@article{ref1,
title="Visibility of red, green, amber and white signal lights in a highway scene",
journal="American journal of optometry and archives of American Academy of Optometry",
year="1967",
author="Allen, Merrill J. and Strickland, J. and Adams, A. J.",
volume="44",
number="2",
pages="105-109",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9408",
doi="",
url="http://dx.doi.org/"
}