@article{ref1,
title="The acoustic attenuation characteristics of 26 hearing protectors evaluated following the British standard procedure",
journal="Annals of occupational hygiene",
year="1977",
author="Martin, A. M.",
volume="20",
number="3",
pages="229-246",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0003-4878",
doi="",
url="http://dx.doi.org/"
}