@article{ref1,
title="Some immediate effects of drowsiness and sleep on normal human performance",
journal="Human factors",
year="1961",
author="Simon, C. W.",
volume="3",
number="1",
pages="1-17",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}