@article{ref1,
title="The sleep waking cycle in healthy test subjects",
journal="Waking and sleeping",
year="1976",
author="Jovanovic, UJ",
volume="1",
number="1",
pages="7-26",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0340-0905",
doi="",
url="http://dx.doi.org/"
}