1. C. S. Gardner, J. M. Green, M. Kruskal, and R. M. Miura, "Method for solving the Korteweg?de Vries equation," Phys. Rev. Lett.,19, 1095?1097 (1967).
2. P. D. Lax, "Integrals of nonlinear equations of evolution and solitary waves," Comm. Pure Appl. Math.,21, 467?490 (1968).
3. V. E. Zakharov and A. B. Shabat, "A refined theory of two-dimensional self-focussing and one-dimensional self-modulation of waves in nonlinear media," Zh. Éksp. Teor. Fiz.,61, No. 1, 118?134 (1971).
4. V. E. Zakharov and A. B. Shabat, "On the interaction of solitons in a stable medium," Zh. Éksp. Teor. Fiz.,64, No. 5, 1627?1639 (1973).
5. V. E. Zakharov, "The method of the inverse scattering problem," in: Theory of Elastic Media with Microstructure, edited by I. A. Kukin [in Russian], Nauka, Moscow (1974).