@article{ref1,
title="The twelve-hour shift revisited: recent trends in the electric power industry",
journal="Journal of human ergology",
year="1982",
author="Kelly, Robert J. and Schneider, M. F.",
volume="11",
number="Suppl",
pages="369-384",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0300-8134",
doi="",
url="http://dx.doi.org/"
}