@article{ref1,
title="A "critical" tracking task for man-machine research related to the operator's effective delay time. I. Theory and experiments with a first-order divergent controlled element. NASA CR-616",
journal="NASA contractor report. NASA CR.",
year="1966",
author="Jex, H. R. and McDonnell, J. D. and Phatak, A. V.",
volume="ePub",
number="ePub",
pages="1-105",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0565-7059",
doi="",
url="http://dx.doi.org/"
}