@article{MZM_1994_55_5_a3,
     author = {Yu. M. Vorob'ev and V. M. Itskov},
     title = {Quasi-modes corresponding to the stable type of conditionally periodic motion},
     journal = {Matemati\v{c}eskie zametki},
     pages = {36--42},
     year = {1994},
     volume = {55},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1994_55_5_a3/}
}