@article{ref1,
title="Adjunctive behavior in humans during game playing",
journal="Physiology and behavior",
year="1975",
author="Cook, Peter and Wayner, M. J. and Singer, G. and Wallace, Michael",
volume="14",
number="5",
pages="651-654",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0031-9384",
doi="",
url="http://dx.doi.org/"
}