@article{ref1,
title="Peak head acceleration of athletes during competition--football",
journal="Medicine and science in sports",
year="1971",
author="Moon, D. W. and Beedle, C. W. and Kovacic, C. R.",
volume="3",
number="1",
pages="44-50",
abstract="<p>[Abstract unavailable]   Keywords: American football; </p> <p>Language: en</p>",
language="en",
issn="0025-7990",
doi="",
url="http://dx.doi.org/"
}