@article{DE_1991_27_5_a3,
     author = {B. S. Kalitin},
     title = {Development of {Lyapunov's} theorem on stability},
     journal = {Differencialʹnye uravneni\^a},
     pages = {758--766},
     publisher = {mathdoc},
     volume = {27},
     number = {5},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_5_a3/}
}