@article{ref1,
title="Training and transfer of categorization by retarded adults",
journal="American journal of mental deficiency",
year="1972",
author="Nye, W. C. and McManis, D. L. and Haugen, D. M.",
volume="77",
number="2",
pages="199-207",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9351",
doi="",
url="http://dx.doi.org/"
}