@article{ref1,
title="Estimation of visually perceived closure rates",
journal="Human factors",
year="1962",
author="Baker, C. A. and Steedman, W. C.",
volume="4",
number="",
pages="343-347",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}