@article{ref1,
title="Effect of the headball on the cranium and on the brain in football players and its results",
journal="Nervenarzt",
year="1957",
author="Diehl, H. and Wilke, G.",
volume="28",
number="5",
pages="233-234",
abstract="<p>[Abstract unavailable]  Keywords: Soccer</p> <p>Language: de</p>",
language="de",
issn="0028-2804",
doi="",
url="http://dx.doi.org/"
}