@article{ref1,
title="Conceptual clarification of accident occurrence as a premise for comprehensive accident prevention",
journal="Hefte zur Unfallheilkunde",
year="1978",
author="Grassberger, R.",
volume="",
number="130",
pages="317-322",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0085-1469",
doi="",
url="http://dx.doi.org/"
}