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A NEW VIEW OF NONLINEAR WATER WAVES: The Hilbert Spectrum1[J] . Norden E. Huang,Zheng Shen,Steven R. Long.Annual Review of Fluid Mechanics . 1999 (1)
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Engineering Analysisof Biological Variables:and Example of Blood Pressure over1Day .2 Huang W,Shen Z,Huang N E,et al. Proc.Natl.Acad.Sci.USA . 1998