@article{ref1,
title="Effects of spontaneous vs. externally-cued learning on the permanent storage of a schema by retardates",
journal="American journal of mental deficiency",
year="1972",
author="Spitz, H. H. and Webreck, C. A.",
volume="77",
number="2",
pages="163-168",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9351",
doi="",
url="http://dx.doi.org/"
}