@article{ref1,
title="Performance, heart rate, and respiration rate on the day-night continuum",
journal="Perceptual and motor skills",
year="1964",
author="Adkins, Sylvia",
volume="18",
number="2",
pages="409-412",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0031-5125",
doi="10.2466/pms.1964.18.2.409",
url="http://dx.doi.org/10.2466/pms.1964.18.2.409"
}