@article{ref1,
title="Spatial frequency channels in the human visual system: effects of luminance and pattern drift rate",
journal="Vision research",
year="1972",
author="Graham, N.",
volume="12",
number="1",
pages="53-68",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0042-6989",
doi="",
url="http://dx.doi.org/"
}