7Mallat S. A theory for multiresolution signal decomposition:the wavelet representation[J]. IEEE Trans on PAM1,1989,PAM1-11(7) : 673-693.
8Huang N E, Shen Z, Long S R, et al. The empirical mode decomposition and the Hilbert sectrum for non- linear and non-stationary time series analysis[C]// Proceedings of Mathematical Physical and Engineering Sciences454. London:the Royal Society of London, 1998.
9Huang N E, Shen Z. A new view of nonlineear water waves: the Hilbert spectrum[J]. Anne Rev Fluid Mech, 1999 (31) : 417-457.