@article{ref1,
title="Speech interference level and aircraft acoustical environment",
journal="Human factors",
year="1960",
author="Dreher, JJ and Evans, W. E.",
volume="2",
number="1",
pages="18-27",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}