Investigation of wave propagation and reflection in ducts with arbitrary environment using threemicrophone methodLavrentjev, Jüri; Tiikoja, HeikiINTER-NOISE 2008 : 37th International Congress and Exposition on Noise Control Engineering : Shangai, 26-29. October 2008 : proceedings. Vol 32009 / p. 1623-1629 Sound reflection from subsonic flow duct termination exhausting hot jetRämmal, Hans; Lavrentjev, JüriINTER-NOISE 2008 : 37th International Congress and Exposition on Noise Control Engineering : Shangai, 26-29. October 2008 : proceedings. Vol 32009 / p. 1703-1711