7Huang N E, et al. The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis. Proc Roy Soc Lond, Series A, 1998, 454:899.
8Huang N E, et al. A new view of nonlinear water waves: The Hilbert spectrum. Ann Rev Fluid Mech, 1999, 31 : 417.
9Huang N E, et al. A new spectral representation of earthquake data: Hilbert spectral analysis of station TCU129, Chi-Chi, Taiwan,21, September 1999. Bull Soc Seism Am, 2001, 91:1310.
10Hilbert-Huang. Transform Toolbox, Professional Edition V1.0,Princeton Satellite Systems. Princeton: New Jersey, 2000.