9Huang N E, Shen Z,Long S R. A new view of nonlinear waterwaves: The Hilbert spectrum [J]. Annual Review of FluidMechanics, 1999,31: 417-457.
10Huang NE, ShenZ, Long S R. The empirical mode decompositionand the Hilbert spectrum for nonlinear and non-stationary timeseries analysis [J]. Proceedings of the Royal Society of London,1998 , 454(1): 903-995.
