@article{ref1,
title="Short and long-term adjustment of circadian rhythms in 'permanent' night nurses",
journal="Ergonomics",
year="1978",
author="Folkard, Simon and Monk, T. H. and Lobban, M. C.",
volume="21",
number="10",
pages="785-799",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}