@article{ref1,
title="Sleep deprivation and physical fitness in young and older subjects",
journal="Journal of sports medicine and physical fitness",
year="1981",
author="Webb, W. B. and Kaufmann, D. A. and Devy, C. M.",
volume="21",
number="2",
pages="198-202",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-4707",
doi="",
url="http://dx.doi.org/"
}