@article{DAN_1966_167_4_a7,
     author = {T. Sabirov},
     title = {The question of stability of small periodic solutions},
     journal = {Doklady Akademii Nauk},
     pages = {755--757},
     publisher = {mathdoc},
     volume = {167},
     number = {4},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_167_4_a7/}
}