@article{ref1,
title="Detection and recognition of colored signal lights",
journal="Human factors",
year="1972",
author="Hilgendorf, Robert L. and White, R. M. and Reynolds, R. E.",
volume="14",
number="3",
pages="227-236",
abstract="Abstract unavailable.",
language="",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}