@article{DE_1997_33_10_a7,
     author = {A. I. Perov},
     title = {Sufficient conditions for the stability of linear systems with constant coefficients in critical cases},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1349--1357},
     publisher = {mathdoc},
     volume = {33},
     number = {10},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_10_a7/}
}