@article{ref1,
title="Expectation and resistance to extinction under partial reinforcement and risk-taking",
journal="American journal of psychology",
year="1962",
author="Lewis, D. J. and Duncan, C. P.",
volume="75",
number="",
pages="77-84",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9556",
doi="",
url="http://dx.doi.org/"
}