@article{ref1,
title="Matching and maximization on dependent concurrent variable-ratio schedules",
journal="Archiv für Psychologie (Frankf)",
year="1988",
author="Krauth, J. and Hemicker, D.",
volume="139",
number="4",
pages="255-269",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0066-6475",
doi="",
url="http://dx.doi.org/"
}