@article{ref1,
title="The effect of memory load on the circadian variation in performance efficiency under a rapidly rotating shift system",
journal="Ergonomics",
year="1976",
author="Folkard, Simon and Knauth, P. and Monk, T. H.",
volume="19",
number="4",
pages="479-488",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}