@article{ref1,
title="Hearing levels of aerospace workers.",
journal="American Industrial Hygiene Association journal",
year="1979",
author="Ward, W. D.",
volume="40",
number="5",
pages="436-436",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-8894",
doi="",
url="http://dx.doi.org/"
}