Geodesic
Variational principle for equations integrable by the inverse problem method
Funkcionalʹnyj analiz i ego priloženiâ, Tome 14 (1980) no. 1, pp. 55-56.

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     title = {Variational principle for equations integrable by the inverse problem method},
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V. E. Zakharov; A. V. Mikhailov. Variational principle for equations integrable by the inverse problem method. Funkcionalʹnyj analiz i ego priloženiâ, Tome 14 (1980) no. 1, pp. 55-56. http://geodesic.mathdoc.fr/item/FAA_1980_14_1_a10/

[1] Zakharov V.E., Shabat A.V., Funkts. analiz, 13:3 (1979), 13–22 | MR | Zbl