@article{ref1,
title="Air travel and circadian rhythm",
journal="Journal of the Royal College of Physicians of London",
year="1973",
author="Mills, J. N.",
volume="7",
number="2",
pages="122-131",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0035-8819",
doi="",
url="http://dx.doi.org/"
}