@article{ref1,
title="Visual fatigue",
journal="Federation proceedings",
year="1947",
author="Simonson, E. and Brozek, J. and Keys, A.",
volume="6",
number="1 Pt 2",
pages="202-202",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0014-9446",
doi="",
url="http://dx.doi.org/"
}