@article{ref1,
title="Quantity and quality of sleep during the record manned space flight of 438 days",
journal="Human factors and aerospace safety",
year="2001",
author="Gundel, A. and Drescher, J. and Polyakov, VV",
volume="1",
number="1",
pages="87-98",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="1468-9456",
doi="",
url="http://dx.doi.org/"
}