1. Solitons and the Inverse Scattering Transform;Ablowitz,1981
2. Solitons and Spectral Transform I;Calogero,1982
3. Theory of Solitons, the Inverse Scattering Method;Novikov,1984
4. Darboux Transformations and Solitons;Matveev,1991
5. Direct Method in Soliton Theory;Hirota,2004