@article{ref1,
title="Tumor and accident",
journal="Deutsches Medizinisches Journal",
year="1955",
author="Hellner, H.",
volume="6",
number="11-12",
pages="421-425",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0012-1320",
doi="",
url="http://dx.doi.org/"
}