@article{ref1,
title="Studies in physical exertion, III:  effect of signal variation on football charging",
journal="Research quarterly. American Physical Education Association",
year="1931",
author="Miles, W. R. and Graves, B. C.",
volume="2",
number="3",
pages="14-31",
abstract="KEYWORDS: American football<p />",
language="",
issn="2326-7402",
doi="10.1080/23267402.1931.10625037",
url="http://dx.doi.org/10.1080/23267402.1931.10625037"
}