@article{ref1,
title="Comparisons of search time and accuracy among selected outlined geometric symbols with various overlays",
journal="Journal of engineering psychology",
year="1963",
author="Williams, J. R. and Falzon, R. P.",
volume="2",
number="3",
pages="112-118",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-085X",
doi="",
url="http://dx.doi.org/"
}