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@article{FAA_1976_10_1_a3, author = {I. M. Gel'fand and L. A. Dikii}, title = {A {Lie} algebra structure in a formal variational calculation}, journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a}, pages = {18--25}, publisher = {mathdoc}, volume = {10}, number = {1}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/FAA_1976_10_1_a3/} }
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/