@article{ref1,
title="The effect of sleep deprivation on learning and memory in healthy volunteers",
journal="Activitas nervosa superior",
year="1971",
author="Vojtĕchovský, Miloš and Safratovã, V. and Votava, Z. and Feit, V.",
volume="13",
number="2",
pages="143-144",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0001-7604",
doi="",
url="http://dx.doi.org/"
}