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@article{DE_1985_21_4_a7, author = {G. S. Osipenko}, title = {Perturbation of invariant manifolds. {I}}, journal = {Differencialʹnye uravneni\^a}, pages = {615--623}, publisher = {mathdoc}, volume = {21}, number = {4}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1985_21_4_a7/} }
G. S. Osipenko. Perturbation of invariant manifolds. I. Differencialʹnye uravneniâ, Tome 21 (1985) no. 4, pp. 615-623. http://geodesic.mathdoc.fr/item/DE_1985_21_4_a7/