@article{ref1,
title="Some effects of display symbol variation upon operator performance in aircraft interception",
journal="Perceptual and motor skills",
year="1968",
author="Munns, M.",
volume="26",
number="3",
pages="Suppl:1215+-Suppl:1215+",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0031-5125",
doi="",
url="http://dx.doi.org/"
}