@article{ref1,
title="Target size and visual recognition",
journal="Human factors",
year="1960",
author="Steedman, W. C. and Baker, C. A.",
volume="2",
number="",
pages="120-127",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}