@article{ref1,
title="Less than 24 hour pseudo-periodicity in work schedules of train drivers, in relation to their sleep",
journal="International archives of occupational and environmental health",
year="1978",
author="Parrot, J. and Petiot, J. C.",
volume="41",
number="3",
pages="179-188",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0340-0131",
doi="",
url="http://dx.doi.org/"
}