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@article{DE_1967_3_6_a0, author = {A. V. Kostin}, title = {Asymptotic series in the theory of nonlinear systems of ordinary differential equations. {I}}, journal = {Differencialʹnye uravneni\^a}, pages = {875--889}, publisher = {mathdoc}, volume = {3}, number = {6}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1967_3_6_a0/} }
A. V. Kostin. Asymptotic series in the theory of nonlinear systems of ordinary differential equations. I. Differencialʹnye uravneniâ, Tome 3 (1967) no. 6, pp. 875-889. http://geodesic.mathdoc.fr/item/DE_1967_3_6_a0/