[5] [5] Huang N E,Shen Z,Long S R,et al.Proc R.Soc.Lond.A,1998,454:899

[6] [6] Huang N E,Shen Z,Long S R,et al.Annu.Rev.Fluid Mech.,1999,31:417

[8] [8] Flandrin Patrick,Rilling Gabriel,Goncalves Paulo.IEEE Signal Processing Letters,2004,11(2):112.

[10] [10] Boudraa A O,Cexus J C,Saidi Z.International Journal of Signal Processing,2004,1(1):33.

[11] [11] Donoho D L.IEEE Transaction on Information,1995,41(3):613