@article{ref1,
title="Visual search, stimulus density, and subnormal intelligence",
journal="American journal of mental deficiency",
year="1971",
author="Das, J. P.",
volume="76",
number="3",
pages="357-361",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9351",
doi="",
url="http://dx.doi.org/"
}