@article{DAN_1961_137_1_a3,
     author = {V. M. Volosov},
     title = {The method of averaging},
     journal = {Doklady Akademii Nauk},
     pages = {21--24},
     publisher = {mathdoc},
     volume = {137},
     number = {1},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_137_1_a3/}
}