@article{ref1,
title="Covert conditioning",
journal="Seminars in psychiatry",
year="1972",
author="Agras, W. S.",
volume="4",
number="2",
pages="157-163",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0037-1971",
doi="",
url="http://dx.doi.org/"
}