1. 2U.W.Ganz,P.D.Joppa,T.J.Patten,D.F.Scharpf,"Boeing18-InchFanRigBroadbandNoiseTest",NASA/CR-1998-208704
2. 3ISO5136:2003Acoustics-Determinationofsoundpowerradiatedandotherair-movingdevices-In-ductmethod,2003
3. Multimode radiation from an unflanged, semi-infinite circular duct