@article{ref1,
title="Attention span and generalization of task-related stimulus control: effects of reinforcement contingencies",
journal="Journal of experimental child psychology",
year="1972",
author="Redd, W. H.",
volume="13",
number="3",
pages="527-539",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-0965",
doi="",
url="http://dx.doi.org/"
}