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@article{MZM_1983_33_3_a1, author = {A. D. Bryuno}, title = {Noncanonical invariants of {Hamiltonian} systems}, journal = {Matemati\v{c}eskie zametki}, pages = {333--344}, publisher = {mathdoc}, volume = {33}, number = {3}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1983_33_3_a1/} }
A. D. Bryuno. Noncanonical invariants of Hamiltonian systems. Matematičeskie zametki, Tome 33 (1983) no. 3, pp. 333-344. http://geodesic.mathdoc.fr/item/MZM_1983_33_3_a1/