@article{DE_1969_5_4_a5,
     author = {L. D. Akulenko},
     title = {On the question of the {Ljapunov} stability of resonance solutions of certain multifrequency systems with a weak constraint},
     journal = {Differencialʹnye uravneni\^a},
     pages = {657--661},
     publisher = {mathdoc},
     volume = {5},
     number = {4},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_4_a5/}
}