@article{ref1,
title="Schedule control of alcohol versus water selection by rats",
journal="Quarterly journal of studies on alcohol",
year="1972",
author="Keehn, J. D. and Coulson, G. E.",
volume="33",
number="2",
pages="395-399",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0033-5649",
doi="",
url="http://dx.doi.org/"
}