@article{ref1,
title="Visual discrimination and response programming",
journal="Psychological research",
year="1987",
author="Heuer, H.",
volume="49",
number="2-3",
pages="91-98",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0340-0727",
doi="",
url="http://dx.doi.org/"
}