@article{ref1,
title="Seasonal depression and sleep disturbances in Alaska and Siberia: a pilot study",
journal="Arctic medical research",
year="1991",
author="Hellekson, C. J. and Booker, J. M. and Putilov, A. A. and Danilenko, K. V.",
volume="50",
number="Suppl",
pages="281-284",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0782-226X",
doi="",
url="http://dx.doi.org/"
}