@article{ref1,
title="Same causes--same effects",
journal="Zentralblatt fur Arbeitsmedizin und Arbeitsschutz",
year="1965",
author="Knop, W.",
volume="15",
number="12",
pages="292-294",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0044-4049",
doi="",
url="http://dx.doi.org/"
}