@article{ref1,
title="Circadian timing",
journal="Annals of the New York Academy of Sciences",
year="1984",
author="Aschoff, J.",
volume="423",
number="",
pages="442-468",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0077-8923",
doi="",
url="http://dx.doi.org/"
}