@article{DE_1974_10_9_a10,
     author = {G. N. Petrovskiǐ},
     title = {Certain properties of systems of linear differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1652--1661},
     publisher = {mathdoc},
     volume = {10},
     number = {9},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_9_a10/}
}