@article{ref1,
title="COED: A device for the experimental study of man-machine systems",
journal="Human factors",
year="1961",
author="Johnson, R. H. and Gordon, D. A. and Patterson, WE",
volume="3",
number="1",
pages="60-65",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}