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@article{DE_1988_24_6_a7, author = {G. S. Osipenko}, title = {Perturbation of invariant manifolds. {IV}}, journal = {Differencialʹnye uravneni\^a}, pages = {987--993}, publisher = {mathdoc}, volume = {24}, number = {6}, year = {1988}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1988_24_6_a7/} }
G. S. Osipenko. Perturbation of invariant manifolds. IV. Differencialʹnye uravneniâ, Tome 24 (1988) no. 6, pp. 987-993. http://geodesic.mathdoc.fr/item/DE_1988_24_6_a7/