@article{ref1,
title="A technique for evaluating man-machine system designs",
journal="Human factors",
year="1961",
author="Siegel, A. I. and Wolf, JJ",
volume="3",
number="1",
pages="18-28",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}