1. D. Y. Benney, "Some properties of long nonlinear waves," Stud. Appl. Math.,52, No. 1, 45?50 (1973).
2. R. M. Miura, "Conservation laws for the fully nonlinear long wave equations," Stud. Appl. Math.,53, No. 1, 45?56 (1974).
3. B. A. Kupershmit and Yu. I. Manin, "Equation of long waves with free surface. I. Conservation laws and solutions; II. Hamiltonian structure and higher equations," Funkts. Anal.,11, No. 3, 31?42 (1977);12, No. 1, 25?37 (1978).
4. S. V. Manakov, "On the theory of two-dimensional stationary self-focusing of electromagnetic waves," Zh. Eksp. Teor. Fiz.,65, No. 2, 505?516 (1973).
5. V. E. Zakharov, "Hamiltonian formalism for waves in nonlinear media with dispersion," Izv. Vyssh. Uchebn. Zaved., Radiofiz.,22, No. 4, 431?453 (1974).