@article{DE_1977_13_5_a20,
     author = {G. N. Petrovskiǐ},
     title = {A property of matrix exponentials},
     journal = {Differencialʹnye uravneni\^a},
     pages = {954--955},
     publisher = {mathdoc},
     volume = {13},
     number = {5},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_5_a20/}
}