Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1967_1_3_a10, author = {A. D. Bryuno}, title = {Formal stability of {Hamiltonian} systems}, journal = {Matemati\v{c}eskie zametki}, pages = {325--330}, publisher = {mathdoc}, volume = {1}, number = {3}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1967_1_3_a10/} }
A. D. Bryuno. Formal stability of Hamiltonian systems. Matematičeskie zametki, Tome 1 (1967) no. 3, pp. 325-330. http://geodesic.mathdoc.fr/item/MZM_1967_1_3_a10/