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Всеволод Эдуардович Адлер, Vsevolod Eduardovich Adler, Алексей Борисович Шабат, Alexey Borisovich Shabat, Равиль Исламович Ямилов, Ravil Islamovich Yamilov. "Симметрийный подход к проблеме интегрируемости." Теоретическая и математическая физика 125.3 (2000) 355-424