@article{ref1,
title="Shift work. shift-dependent well-being and individual differences",
journal="Ergonomics",
year="1981",
author="Akerstedt, Torbjörn and Torsvall, L.",
volume="24",
number="4",
pages="265-273",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}