@article{ref1,
title="A reappraisal of artificial signals as an aid to a visual monitoring task",
journal="Ergonomics",
year="1975",
author="Murrell, G. A.",
volume="18",
number="6",
pages="693-700",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}