@article{ref1,
title="Variations in sleep schedules",
journal="Waking and sleeping",
year="1977",
author="Naitoh, P. and Johnson, L. Clark and Lubin, A. and Moses, J. M.",
volume="1",
number="2",
pages="133-137",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0340-0905",
doi="",
url="http://dx.doi.org/"
}