@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/}
}