@article{DE_2002_38_11_a15,
     author = {B. S. Kalitin},
     title = {Stability of {Closed} {Invariant} {Sets} of {Semidynamical} {Systems.} {The} {Method} of {Sign} {Definite} {Lyapunov} {Functions}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1565--1566},
     publisher = {mathdoc},
     volume = {38},
     number = {11},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2002_38_11_a15/}
}