@article{ref1,
title="Human estimates of randomly perturbed functional values",
journal="Human factors",
year="1967",
author="Hillix, W. A. and Kapfer, E. L. Jr and Hershman, R. L.",
volume="9",
number="3",
pages="263-272",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}