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4. P. D. MCFADDEN, 1985, Aero Propulsion Report 169, DSTO, Australia, Analysis of the vibration of the input bevel pinion in RAN wessex helicopter main rotor gearbox WAK143 prior to failure
5. F. K. CHOY, et al., 1994, NASA Technical Memorandum 106623, Vibration signature analysis of a faulted gear transmission system