@article{ref1,
title="Continuous measurement of the depth of sleep",
journal="Science",
year="1958",
author="Lester, David",
volume="127",
number="3310",
pages="1340-1341",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0036-8075",
doi="",
url="http://dx.doi.org/"
}