@article{ref1,
title="Ambient head temperature and football helmet design",
journal="Medicine and science in sports",
year="1973",
author="Coleman, A. E. and Mortagy, A. K.",
volume="5",
number="3",
pages="204-208",
abstract="unavailable.  Keywords: American football",
language="en",
issn="0025-7990",
doi="",
url="http://dx.doi.org/"
}