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@article{DAN_1975_224_6_a7, author = {V. I. Rozhkov}, title = {Periodic solutions of linear systems with a small parameter in the derivative}, journal = {Doklady Akademii Nauk}, pages = {1268--1271}, publisher = {mathdoc}, volume = {224}, number = {6}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1975_224_6_a7/} }
V. I. Rozhkov. Periodic solutions of linear systems with a small parameter in the derivative. Doklady Akademii Nauk, Tome 224 (1975) no. 6, pp. 1268-1271. http://geodesic.mathdoc.fr/item/DAN_1975_224_6_a7/