@article{ref1,
title="Model of human operator response to step transitions in controlled element dynamics. NASA CR-671",
journal="NASA contractor report. NASA CR.",
year="1967",
author="Weir, D. H. and Phatak, A. V.",
volume="",
number="",
pages="1-33",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0565-7059",
doi="",
url="http://dx.doi.org/"
}