@article{ref1,
title="The sleep of skydivers: a study of stress",
journal="Psychophysiology",
year="1978",
author="Beaumaster, E. J. and Knowles, J. B. and MacLean, A. W.",
volume="15",
number="3",
pages="209-213",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0048-5772",
doi="",
url="http://dx.doi.org/"
}