@article{DAN_1977_232_1_a4,
     author = {V. S. Kozyakin},
     title = {Subfurcation of periodic oscillations},
     journal = {Doklady Akademii Nauk},
     pages = {24--27},
     publisher = {mathdoc},
     volume = {232},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_232_1_a4/}
}