@article{ref1,
title="The burden of sight and hearing in the workplace and in the environment",
journal="Deutsche Medizinische Wochenschrift",
year="2007",
author="Letzel, Stephan",
volume="132",
number="8",
pages="365-366",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0012-0472",
doi="10.1055/s-2007-970348",
url="http://dx.doi.org/10.1055/s-2007-970348"
}