@article{ref1,
title="Effects of accelerating and decelerating consequences on the social behavior of trainable retarded children",
journal="Child development",
year="1972",
author="Kopfstein, D.",
volume="43",
number="3",
pages="800-809",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0009-3920",
doi="",
url="http://dx.doi.org/"
}