@article{ref1,
title="Longitudinal study on the causes of accidents in a large factory",
journal="Deutsche Gesundheitswesen",
year="1967",
author="Hempel, E. and Kneist, W. and Petermann, A.",
volume="22",
number="20",
pages="948-952",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0012-0219",
doi="",
url="http://dx.doi.org/"
}