@article{ref1,
title="Effects of drugs on characteristics of behavior maintained by complex schedules of intermittent positive reinforcement",
journal="Annals of the New York Academy of Sciences",
year="1956",
author="Morse, W. H. and Herrnstein, R. J.",
volume="65",
number="4",
pages="303-317",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0077-8923",
doi="10.1111/j.1749-6632.1956.tb49641.x",
url="http://dx.doi.org/10.1111/j.1749-6632.1956.tb49641.x"
}