1. Solitons as particles, oscillators, and in slowly changing media: A singular perturbation theory;Kaup,1978
2. Linear and Nonlinear Waves;Whitham,1974
3. Elements of Soliton Theory;Lamb,1980
4. Solitons: An Introduction;Drazin,1989
5. Solitons and Nonlinear Wave Equations;Dodd,1982