1. Soliton: An Introduction;Drazin,1993
2. Linear and Nonlinear Waves;Whitham,1974
3. Nonlinear Water Waves;Debnath,1994
4. Solitons: Nonlinear Evolution Equations and Inverse Scattering;Ablowitz,1991
5. M.R. Miura, Backlund Transformation, Springer-Verlag, Berlin