@article{ref1,
title="Some psychological factors in flicker and fusion",
journal="American journal of optometry and archives of American Academy of Optometry",
year="1951",
author="Knox, G. W.",
volume="28",
number="4",
pages="221-226",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9408",
doi="",
url="http://dx.doi.org/"
}