@article{ref1,
title="Subjective appraisal of comfortable brightness relationships",
journal="American journal of optometry and archives of American Academy of Optometry",
year="1951",
author="Guth, S. K.",
volume="28",
number="9",
pages="468-483",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9408",
doi="",
url="http://dx.doi.org/"
}