@article{DAN_1968_181_4_a9,
     author = {T. Sabirov},
     title = {The stability of small periodic solutions at multidimensional degeneracies},
     journal = {Doklady Akademii Nauk},
     pages = {805--807},
     publisher = {mathdoc},
     volume = {181},
     number = {4},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_181_4_a9/}
}