@article{ref1,
title="Experimental studies of shift-work I: A comparison of 'rotating' and 'stabilized' 4-hour shift systems",
journal="Ergonomics",
year="1968",
author="Colquhoun, W. P. and Blake, M. J. and Edwards, R. S.",
volume="11",
number="5",
pages="437-453",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}