@article{FAA_1976_10_4_a2,
     author = {I. M. Gel'fand and Yu. I. Manin and M. A. Shubin},
     title = {Poisson brackets and the kernel of the variational derivative in the formal calculus of variations},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {30--34},
     publisher = {mathdoc},
     volume = {10},
     number = {4},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1976_10_4_a2/}
}