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@article{DE_1987_23_5_a10, author = {G. S. Osipenko}, title = {Perturbation of invariant manifolds. {III}}, journal = {Differencialʹnye uravneni\^a}, pages = {818--825}, publisher = {mathdoc}, volume = {23}, number = {5}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1987_23_5_a10/} }
G. S. Osipenko. Perturbation of invariant manifolds. III. Differencialʹnye uravneniâ, Tome 23 (1987) no. 5, pp. 818-825. http://geodesic.mathdoc.fr/item/DE_1987_23_5_a10/