@article{ref1,
title="Association of melatonin secretion with seasonal luminosity in human subjects",
journal="International journal of circumpolar health",
year="2003",
author="Leppäluoto, Juhani",
volume="62",
number="3",
pages="223-227",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="1239-9736",
doi="10.3402/ijch.v62i3.17559",
url="http://dx.doi.org/10.3402/ijch.v62i3.17559"
}