@article{ref1,
title="Suggested safety modifications for football helmet",
journal="Maryland state medical journal",
year="1962",
author="Henderson, C. M. and Poffenbarger, A. L.",
volume="11",
number="",
pages="497-499",
abstract="unavailable.]  Keywords: American football<p />",
language="en",
issn="0025-4363",
doi="",
url="http://dx.doi.org/"
}