@article{ref1,
title="Volume of warning signals of emergency vehicles in traffic",
journal="Acta oto-laryngologica",
year="1973",
author="Salmivalli, A. and Puhakka, H. J.",
volume="75",
number="4",
pages="348-349",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-6489",
doi="",
url="http://dx.doi.org/"
}