@article{ref1,
title="The social background in the postconcussion syndrome",
journal="Hefte zur Unfallheilkunde",
year="1967",
author="Zwirner, R.",
volume="91",
number="",
pages="246-250",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0085-1469",
doi="",
url="http://dx.doi.org/"
}