@article{ref1,
title="Effect of a 21-hour day on the human circadian excretory rhythms of 17-hydroxycorticosteroids and electrolytes",
journal="Aerospace medicine",
year="1967",
author="Simpson, H. W. and Lobban, M. C.",
volume="38",
number="12",
pages="1205-1213",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}