A Lie algebra structure in a formal variational calculation
Funkcionalʹnyj analiz i ego priloženiâ, Tome 10 (1976) no. 1, pp. 18-25.

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I. M. Gel'fand; L. A. Dikii. A Lie algebra structure in a formal variational calculation. Funkcionalʹnyj analiz i ego priloženiâ, Tome 10 (1976) no. 1, pp. 18-25. http://geodesic.mathdoc.fr/item/FAA_1976_10_1_a3/

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