@article{ref1,
title="Validity of subjective reports of sleep latency in normal subjects",
journal="Ergonomics",
year="1977",
author="Johns, M. W.",
volume="20",
number="6",
pages="683-690",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}