@article{ref1,
title="Selection of personal hearing-protective devices",
journal="Zentralblatt fur Arbeitsmedizin, Arbeitsschutz und Prophylaxe",
year="1978",
author="Kuhn, H. D.",
volume="28",
number="3",
pages="81-85",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0340-7047",
doi="",
url="http://dx.doi.org/"
}