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@article{DE_1987_23_10_a4, author = {K. V. Mal'kov and M. M. Khapaev}, title = {Some methods in perturbation theory connected with averaging}, journal = {Differencialʹnye uravneni\^a}, pages = {1693--1704}, publisher = {mathdoc}, volume = {23}, number = {10}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1987_23_10_a4/} }
K. V. Mal'kov; M. M. Khapaev. Some methods in perturbation theory connected with averaging. Differencialʹnye uravneniâ, Tome 23 (1987) no. 10, pp. 1693-1704. http://geodesic.mathdoc.fr/item/DE_1987_23_10_a4/