@article{ref1,
title="The seventh occupational diseases regulation",
journal="Medizinische Klinik [Urban und Schwarzenberg]",
year="1968",
author="Martens, H. H.",
volume="63",
number="45",
pages="1825-1826",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0025-8458",
doi="",
url="http://dx.doi.org/"
}