@article{ref1,
title="The process of occurrence and recovery of psychological and physiological fatigue by sleep deprivation for fifty hours in man",
journal="Annals of physiological anthropology",
year="1984",
author="Sakamoto, K. and Seki, K. and Usui, Tomohiko",
volume="3",
number="1",
pages="19-29",
abstract="<p>[Abstract unavailable]</p> <p>Language: ja</p>",
language="ja",
issn="0287-8429",
doi="",
url="http://dx.doi.org/"
}