@article{ref1,
title="The problem of the post concussion syndrome",
journal="Proceedings of the Rudolf Virchow Medical Society in the City of New York",
year="1964",
author="Strauss, H.",
volume="23",
number="",
pages="135-147",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0080-4797",
doi="",
url="http://dx.doi.org/"
}