@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/}
}