@article{DAN_1960_133_2_a2,
     author = {V. M. Volosov},
     title = {Averaging of some perturbed motions},
     journal = {Doklady Akademii Nauk},
     pages = {261--264},
     year = {1960},
     volume = {133},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_133_2_a2/}
}