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2. Proc. Symp. on Differential Geometry and Differential Equations;Morse,1986
3. Proc. RIMS Symp. on Nonlinear Integrable Systems, Kyoto, Japan;Flaschka,1983
4. Theory of Solitons, the Inverse Scattering Methods;Novikov,1984
5. Investigation of Equations of Korteweg-De Vries Type by the Method of Recurrence Relations