@article{DE_1969_5_5_a3,
     author = {A. S. Gurtovnik and Yu. I. Neimark},
     title = {On the question of the stability of quasiperiodic motions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {824--832},
     publisher = {mathdoc},
     volume = {5},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_5_a3/}
}