@article{DE_1983_19_2_a17,
     author = {N. A. Izobov and E. A. Barabanov},
     title = {The form of the highest $\sigma $-exponent of a linear system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {359--362},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_2_a17/}
}