@article{ref1,
title="Skull contusion and concussion: problems of reporting (author's transl)",
journal="Offentliche Gesundheitswesen",
year="1977",
author="Helbig, S.",
volume="39",
number="6",
pages="328-330",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0029-8573",
doi="",
url="http://dx.doi.org/"
}