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@article{DAN_1980_251_1_a15, author = {V. V. Beletskii and G. V. Kasatkin}, title = {Extremal properties of resonant motions}, journal = {Doklady Akademii Nauk}, pages = {58--62}, publisher = {mathdoc}, volume = {251}, number = {1}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1980_251_1_a15/} }
V. V. Beletskii; G. V. Kasatkin. Extremal properties of resonant motions. Doklady Akademii Nauk, Tome 251 (1980) no. 1, pp. 58-62. http://geodesic.mathdoc.fr/item/DAN_1980_251_1_a15/