@article{ref1,
title="A method of evaluating large numbers of system alternatives",
journal="Human factors",
year="1968",
author="Sadacca, R. and Root, R. T.",
volume="10",
number="1",
pages="5-10",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}