@article{ref1,
title="Circadian oscillations of three parameters at defined light intensities and color",
journal="Journal of applied physiology (APS DC)",
year="1968",
author="Winget, C. M. and Card, D. H. and Pope, J. M.",
volume="24",
number="3",
pages="401-406",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0021-8987",
doi="",
url="http://dx.doi.org/"
}