1. Early detection of gear failure by vibration analysis i. Calculation of the time-frequency distribution;Wang;Mech. Syst. Sig. Process.,1993
2. Review of vibration-based helicopters health and usage monitoring methods;Giurgiutiu,2001
3. Assessment of present maintenance practices and future trends;Polimac,2001
4. SH-60 helicopter integrated diagnostic system (HIDS) program-diagnostic and prognostic development experience;Hardman,1999
5. Prognostics, the real issues involved with predicting life remaining;Engel,2002