@article{ref1,
title="Perception time and spatial frequency",
journal="Vision research",
year="1976",
author="Vassilev, A. and Mitov, D.",
volume="16",
number="1",
pages="89-82",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0042-6989",
doi="",
url="http://dx.doi.org/"
}