@article{ref1,
title="Night and shift work of engine drivers. 1. Investigations of the daily working hours and the distribution of leisure time and sleep",
journal="Internationales Archiv für Arbeitsmedizin",
year="1974",
author="Rutenfranz, J. and Knauth, P. and Hildebrandt, G. and Rohmert, W.",
volume="32",
number="4",
pages="243-259",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0020-5923",
doi="",
url="http://dx.doi.org/"
}