@article{MZM_1990_48_1_a2,
     author = {Yu. N. Bibikov},
     title = {Bifurcation of a~stable invariant torus from an equilibrium},
     journal = {Matemati\v{c}eskie zametki},
     pages = {15--19},
     publisher = {mathdoc},
     volume = {48},
     number = {1},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_48_1_a2/}
}