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@article{DE_1982_18_5_a20, author = {A. A. Bel'kovich}, title = {Quasiperiodic solutions of {Hamiltonian} systems with a small parameter}, journal = {Differencialʹnye uravneni\^a}, pages = {886--889}, publisher = {mathdoc}, volume = {18}, number = {5}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1982_18_5_a20/} }
A. A. Bel'kovich. Quasiperiodic solutions of Hamiltonian systems with a small parameter. Differencialʹnye uravneniâ, Tome 18 (1982) no. 5, pp. 886-889. http://geodesic.mathdoc.fr/item/DE_1982_18_5_a20/