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2. Linear and Nonlinear Waves;Whitham,1974
3. The author's notes according to the lecture given by R. K. Bullough at Zhejiang University (PRC) in 1983.
4. Solitons and the Inverse Scattering Transform;Ablowitz,1981
5. Solitons and the Inverse Scattering Transform;Ablowitz,1981