@article{ref1,
title="Circadian rhythm of pilots' efficiency and effects of multiple time zone travel",
journal="Aerospace medicine",
year="1970",
author="Klein, K. E. and Brüner, H. and Holtmann, H. and Rehme, H. and Stolze, J. and Steinhoff, W. D. and Wegmann, H. M.",
volume="41",
number="2",
pages="125-132",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}