(a) Investigations on Improving the Method of Noise Measurement for Powered Vehicles (Report Number 10506067 by order of the Germany Federal Environmental Agency, August 1999, Steven, H.)
a) Investigations on Improving the Method of Noise Measurement for Powered Vehicles (Rapport no 10506067 établi pour le compte de l &apos; Agence fédérale allemande pour l &apos; environnement, août 1999, Steven, H.);