@article{ref1,
title="When is "uh-huh" reinforcing?",
journal="Perceptual and motor skills",
year="1958",
author="Solley, Charles M. and Long, John",
volume="8",
number="3",
pages="277-277",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0031-5125",
doi="10.2466/pms.1958.8.3.277",
url="http://dx.doi.org/10.2466/pms.1958.8.3.277"
}