@article{ref1,
title="Causes and frequency of head injuries in childhood",
journal="Nervenarzt",
year="1970",
author="Roos, W.",
volume="41",
number="4",
pages="178-181",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0028-2804",
doi="",
url="http://dx.doi.org/"
}