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@article{DE_1969_5_2_a0, author = {V. A. Pliss}, title = {On the theory of invariant sets in periodic systems of differential equations}, journal = {Differencialʹnye uravneni\^a}, pages = {215--227}, publisher = {mathdoc}, volume = {5}, number = {2}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1969_5_2_a0/} }
V. A. Pliss. On the theory of invariant sets in periodic systems of differential equations. Differencialʹnye uravneniâ, Tome 5 (1969) no. 2, pp. 215-227. http://geodesic.mathdoc.fr/item/DE_1969_5_2_a0/