@article{ref1,
title="A perceptual flexibility battery",
journal="Perceptual and motor skills",
year="1961",
author="Ittelson, William H. and Seidenberg, Bernard and Kutash, Samuel B.",
volume="12",
number="1",
pages="3-9",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0031-5125",
doi="10.2466/pms.1961.12.1.3",
url="http://dx.doi.org/10.2466/pms.1961.12.1.3"
}