@article{ref1,
title="Vigilance as a function of stimulus variety and response complexity",
journal="Human factors",
year="1964",
author="Luce, T. S.",
volume="6",
number="",
pages="101-110",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}