@article{ref1,
title="Displacement of the sleep period and sleep deprivation. Implications for shift work",
journal="Human neurobiology",
year="1982",
author="Akerstedt, Torbjörn and Gillberg, M.",
volume="1",
number="3",
pages="163-171",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0721-9075",
doi="",
url="http://dx.doi.org/"
}