@article{ref1,
title="Circadian variation of F.E.V. in shift workers",
journal="British journal of industrial medicine",
year="1969",
author="Gubéran, E. and Williams, M. K. and Walford, J. and Smith, M. M.",
volume="26",
number="2",
pages="121-125",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0007-1072",
doi="",
url="http://dx.doi.org/"
}