@article{ref1,
title="A method of comparing the impact absorption characteristics of football helmets",
journal="Medicine and science in sports",
year="1971",
author="Kindt, G. W. and Schneider, R. C. and Robinson, J. L.",
volume="3",
number="4",
pages="203-209",
abstract="<p>[Abstract unavailable]  Keywords: American football </p> <p>Language: en</p>",
language="en",
issn="0025-7990",
doi="",
url="http://dx.doi.org/"
}