@article{ref1,
title="Urban noise model",
journal="Journal of the Acoustical Society of America",
year="1974",
author="Malchaire, J. B. and Horstman, S. W.",
volume="56",
number="6",
pages="1811-1814",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-4966",
doi="",
url="http://dx.doi.org/"
}