@article{ref1,
title="Head injury in hemophiliacs",
journal="JAMA journal of the American Medical Association",
year="1977",
author="Penner, J. A. and Kelly, P. E.",
volume="237",
number="7",
pages="641-641",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0098-7484",
doi="",
url="http://dx.doi.org/"
}