@article{ref1,
title="Possibilities of measuring the efficiency of accident preventive actions",
journal="Zentralblatt fur Arbeitsmedizin und Arbeitsschutz",
year="1971",
author="Diekershoff, K. H.",
volume="21",
number="12",
pages="368-372",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0044-4049",
doi="",
url="http://dx.doi.org/"
}