@article{ref1,
title="Utility of several clinical tests of color-defective vision in predicting daytime and nighttime performance with the aviation signal light gun",
journal="Aerospace medicine",
year="1974",
author="Steen, J. A. and Collins, W. E. and Lewis, M. F.",
volume="45",
number="5",
pages="467-472",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}