@article{DAN_1961_136_4_a7,
     author = {M. Ya. Kushul},
     title = {The stability of forced oscillations in autorotating systems},
     journal = {Doklady Akademii Nauk},
     pages = {787--790},
     publisher = {mathdoc},
     volume = {136},
     number = {4},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_136_4_a7/}
}