@article{DAN_1962_145_4_a2,
     author = {V. M. Volosov},
     title = {Averaging in certain systems of differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {713--715},
     publisher = {mathdoc},
     volume = {145},
     number = {4},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_145_4_a2/}
}