@article{ref1,
title="Variation of operator's strategies and regulating effects on workload",
journal="Ergonomics",
year="1971",
author="Spearandio, J. C.",
volume="14",
number="5",
pages="571-577",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0014-0139",
doi="10.1080/00140137108931277",
url="http://dx.doi.org/10.1080/00140137108931277"
}