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@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/} }
A. N. Filatov. Partial averaging in systems of ordinary differential equations. Differencialʹnye uravneniâ, Tome 6 (1970) no. 6, pp. 1118-1120. http://geodesic.mathdoc.fr/item/DE_1970_6_6_a17/