Experimental determination of acoustic reflection coefficient of duct openings in simulated hot conditions [Electronic resource]Rämmal, Hans; Lavrentjev, JüriProceedings of 33-th International Congress and Exposition on Noise Control Engineering : INTERNOISE2005 : 07-10 August 2005, Rio de Janeiro, Brazil2005 / ? p. [CD-ROM] https://www.ingentaconnect.com/contentone/ince/incecp/2005/00002005/00000007/art00035