@article{ref1,
title="Vigilance in prolonged and repeated sessions",
journal="Perceptual and motor skills",
year="1960",
author="Webb, Wilse B. and Wherry, Robert J.",
volume="10",
number="2",
pages="111-114",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0031-5125",
doi="10.2466/pms.1960.10.2.111",
url="http://dx.doi.org/10.2466/pms.1960.10.2.111"
}