@article{ref1,
title="Cockpit noise intensity: fifteen single-engine light aircraft",
journal="Aerospace medicine",
year="1969",
author="Tobias, J. V.",
volume="40",
number="9",
pages="963-966",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}