@article{ref1,
title="Operational efficiency and time of day",
journal="Human factors",
year="1984",
author="Craig, A. and Condon, R.",
volume="26",
number="2",
pages="197-205",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}