[1] HUANG N E, SHEN Z, LONG S R, et al. The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis［C］//Proceedings of the Royal Society of London, 1998: 903-995.
[2] RILLING G, FLANDRIN P. One or two frequencies The empirical mode decomposition answer［J］. IEEE Transactions on Signal Processing, 2007, 56(1): 85-95.
[5] RATO R T, ORTIGUERIA M D, BATISTA A G. On the HHT, its problems, and some solutions［J］. Mechanical Systems and Signal Processing, 2008, 22(6): 1374-1394.
