1. Solitons; Nonlinear Evolution Equations and Inverse Scattering;Ablowitz,1991
2. Symmetries and Differential Equations;Bluman,1989
3. Darboux Transformation and Solitons;Matveev,1991
4. Direct Methods in Soliton Theory;Hirota,2004
5. Algebro-Geometrical Approach to Nonlinear Integrable Equations;Belokolos,1994