@article{DE_1970_6_6_a17,
     author = {A. N. Filatov},
     title = {Partial averaging in systems of ordinary differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1118--1120},
     publisher = {mathdoc},
     volume = {6},
     number = {6},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_6_a17/}
}