[1] Huang N E, Zheng Shen, Long S R, et al. Proc. R Soc. Lond A, 1998, 454: 903.
[5] Huang N E, Wu M, Long S, et al. Proc. R Soc. Lond A, 2003, 459: 2317.
[6] Huang N E, Long S R. Annual Review of Fluid Mechanics, 1999, 31: 417.
[7] Wu Z H, Huang N E. Advances in Adaptive Data Analysis, 2009, 1(1): 1.
