@article{ref1,
title="There is more to operant theory and practice: Comment on Guess and Carr",
journal="American journal on mental retardation",
year="1991",
author="Lövaas, O. Ivar and Smith, Tristram",
volume="96",
number="3",
pages="324-327",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0895-8017",
doi="",
url="http://dx.doi.org/"
}