1. Mechanisms of noise transmission through helicopter gearbox support struts;Brennan;J. Vib. Acoust.,1994
2. Helicopter Gearbox Isolation Using Periodically Layered Fluidic Isolators;Szefi,2003
3. Flight test of active gear-mesh noise control on the S-76 aircraft;Millott,1998
4. Helicopter gear noise and its transmission to the cabin;Pollard,1977
5. Development of Rotorcraft Interior Noise Control Concepts;Yoerkie,1983