1. G. B. Whitham, Linear and Nonlinear Waves, Wiley, New York (1974).
2. M. J. Ablowitzand H. Segur, Solitons and the Inverse Scattering Transform, SIAM, Philadelphia (1981).
3. V. E. Zakharov, S. Novikov, S. V. Manakov, and L. P. Pitaevskii, Theory of Solitons: Inverse Problem Method [in Russian], Nauka, Moscow (1980); English transl.
4. S. Novikov, S. V. Manakov, L. P. Pitaevskii, and V. E. Zakharov, Theory of Solitons: The Inverse Scattering Method, Springer, New York (1984).
5. A. C. Newell, Solitons in Mathematics and Physics, SIAM, New York (1985).