@article{DE_1978_14_11_a14,
     author = {Yu. N. Bibikov},
     title = {Representation of quasi-periodic motions near the equilibrium state with the aid of convergent power series},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2065--2067},
     publisher = {mathdoc},
     volume = {14},
     number = {11},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_11_a14/}
}