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@article{DAN_1964_154_2_a6, author = {V. A. Pliss}, title = {Stability of motion in the doubtful case of two zero roots}, journal = {Doklady Akademii Nauk}, pages = {268--270}, publisher = {mathdoc}, volume = {154}, number = {2}, year = {1964}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1964_154_2_a6/} }
V. A. Pliss. Stability of motion in the doubtful case of two zero roots. Doklady Akademii Nauk, Tome 154 (1964) no. 2, pp. 268-270. http://geodesic.mathdoc.fr/item/DAN_1964_154_2_a6/