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@article{DE_1982_18_10_a3, author = {A. G. Kolpakov}, title = {Averaging in a second-order differential equation}, journal = {Differencialʹnye uravneni\^a}, pages = {1680--1684}, publisher = {mathdoc}, volume = {18}, number = {10}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1982_18_10_a3/} }
A. G. Kolpakov. Averaging in a second-order differential equation. Differencialʹnye uravneniâ, Tome 18 (1982) no. 10, pp. 1680-1684. http://geodesic.mathdoc.fr/item/DE_1982_18_10_a3/