@article{ref1,
title="Occupational accidents in the Aachen bituminous coal mining district--comparative study of the years 1970 and 1980",
journal="Zentralblatt für Arbeitsmedizin, Arbeitsschutz, Prophylaxe und Ergonomie",
year="1983",
author="Forst, R. and Bourg, N. P.",
volume="33",
number="2",
pages="34-38",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0173-3338",
doi="",
url="http://dx.doi.org/"
}