@article{DE_1973_9_8_a18,
     author = {I. G. Krosko},
     title = {Sufficient conditions for stability and instability in the sense of {V.} {I.~Zubov} of invariant manifolds of differential systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1527--1529},
     year = {1973},
     volume = {9},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_8_a18/}
}