@article{UZMU_1954_165_165_a6,
     author = {Yu. A. Ryabov},
     title = {Generalization of a theorem of {A.} {M.~Lyapunov}},
     journal = {Uchenye Zapiski Moskovskogo Gosudarstvennogo Universiteta},
     pages = {131--150},
     publisher = {mathdoc},
     volume = {165},
     number = {165},
     year = {1954},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZMU_1954_165_165_a6/}
}