Huang, N.E., Shen, Z., Long, S.R., Wu, M.C., Shih, H.H., Zheng, Q., Yen, N.C., Tung, C.C., and Liu, H.H., “The Empirical Mode Decomposition and the Hilbert Spectrum for Nonlinear and Non-stationary Time Series Analysis”, Proceedings of R. Soc. Lond. A 454, pp. 903–995, (1998).
 Bernal, D., and Gunes, B., “An Examination of Instantaneous Frequency as a Damage Detection Tool”, 14th Engineering Mechanics Conference, Austin, Texas, (2000).
 Quek, S., Tua, P., and Wang, Q., “Comparison of Hilbert-Huang, Wavelet and Fourier Transforms for Selected Applications”, Mini-Symp. on Hilbert-Huang Transform in Engineering Applications, Newark,Delaware, (2003).
 Lin, S., Yang, J., and Zhou, L., “Damage Identification of a Benchmark Building for Structural Health Monitoring”, Smart Materials and Structures, Vol. 14, pp. 162-169, (2005).
 Yu, D., Cheng, J., and Yang, Y., “Application of EMD Method and Hilbert Spectrum to the Fault Diagnosis of Roller Bearings”, Mechanical Systems and Signal Processing, Vol. 19, pp. 259-270, (2005).
 Salvino, L.W., and Pines, D.J., “Structural Health Monitoring using Empirical Mode Decomposition and the Hilbert Phase”, Journal of Sound and Vibration, Vol. 294, pp. 97-124, (2006).
 Gao, R.X., and Yan, R., “Non-stationary Signal Processing for Bearing Health Monitoring”, International Journal of Manufacturing Research, Vol. 1, No. 1, pp. 18 – 40, (2006).
 Loutridis, S. J., “Instantaneous Energy Density as a Feature for Gear Fault Detection”, Mechanical Systems and Signal Processing, Vol. 20, pp. 1239- 1253, (2006).
 Quek, S., Tua, P., and Wang, Q., “Detecting Anomalies in Beams and Plate Based on the Hilbert–Huang Transform of Real Signals”, Smart Materials and Structures, Vol. 12, pp. 447-460, (2003).
 Soorgee, M.H., and Yousefi-Koma, A., “Crack Diagnosis in Beams using Propagated Waves and Hilbert Huang Transformation”, 4th International Conference on NDT, Chania, Crete-Greece, (2007).
 Douka, E., and Hadjileontiadis, J.L., “Time-frequency Analysis of the Free Vibration Response of a Beam with a Breathing Crack”, NDT&E International, Vol. 38, pp. 3-10, (2005).
 Loutridis, S., Douka, E., and Hadjileontiadis, J.L., “Forced Vibration Behaviour and Crack Detection of Cracked Beams using Instantaneous Frequency”, NDT&E International, Vol. 38, pp. 411-419, (2005).
 Shi, Z.Y., Law, S.S., and Xu, X., “Identification of Linear Time-varying made of Dynamical Systems From Forced Excitation using Hilbert Transform and EMD Method”, Journal of Sound and Vibration, Vol. 321, pp. 572-589, (2008).
 Fritsch, F.N., and Carlson, R.E., “Monotone Piecewise Cubic Interpolation”, SIAM J. Numerical Analysis, Vol. 17, pp. 238-246, (1998).
 Wahba, G., “Spline Models for Observational Data”, SIAM, Philadelphia, (1990).
 Hastie, T.J., and Tibshirani, R.J., “GeneralizedAdditive Models”, Chapman and Hall, London, (1990).
 Cheng, S.M., Wu, X.J., Wallace, W., and Swamidas, A.S.J., “Vibrational Response of a Beam with a Breathing Crack”, Journal of Sound and Vibration, Vol. 225, pp. 201-208, (1999).