@article{ref1,
title="Effect of instructions concerning the use of ear protective device by workers exposed to noise",
journal="Zeitschrift fur die Gesamte Hygiene und Ihre Grenzgebiete",
year="1978",
author="Kirchhoff, D. and Sommer, W. and Kober, S.",
volume="24",
number="11",
pages="885-887",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0049-8610",
doi="",
url="http://dx.doi.org/"
}