@article{DE_1980_16_6_a19,
     author = {I. N. Sergeev},
     title = {The interior of a set of systems of differential equations with a stable {Ljapunov} exponent},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1135--1137},
     publisher = {mathdoc},
     volume = {16},
     number = {6},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1980_16_6_a19/}
}