@article{ref1,
title="Signal color recognition by color defective observers",
journal="American journal of optometry and archives of American Academy of Optometry",
year="1959",
author="Heath, G. G. and Schmidt, I.",
volume="36",
number="",
pages="421-427",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9408",
doi="",
url="http://dx.doi.org/"
}