@article{ref1,
title="Maintaining concentration (TAF) as a measure of mental stress",
journal="Ergonomics",
year="1971",
author="Takakuwa, E.",
volume="14",
number="1",
pages="145-158",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}