@article{ref1,
title="Vigilance and task load: in search of the inverted U",
journal="Human factors",
year="1984",
author="Wiener, E. L. and Curry, R. E. and Faustina, M. L.",
volume="26",
number="2",
pages="215-222",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}