@article{ref1,
title="Various research problems in traumatology",
journal="Hefte zur Unfallheilkunde",
year="1967",
author="Kroupa, J.",
volume="91",
number="",
pages="90-97",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0085-1469",
doi="",
url="http://dx.doi.org/"
}