@article{ref1,
title="Previous condition and 91st Article of the Sickness and Accident Insurance Law",
journal="Zeitschrift fur Unfallmedizin und Berufskrankheiten",
year="1956",
author="Hausammann, E.",
volume="49",
number="2",
pages="104-108",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0044-3603",
doi="",
url="http://dx.doi.org/"
}