@article{ref1,
title="Fatigue: its physiological and psychological significance",
journal="Ergonomics",
year="1968",
author="Grandjean, E.",
volume="11",
number="5",
pages="427-436",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}