@article{DE_1982_18_5_a0,
     author = {E. A. Barabanov},
     title = {Properties of the highest $\sigma $-exponent},
     journal = {Differencialʹnye uravneni\^a},
     pages = {739--744},
     publisher = {mathdoc},
     volume = {18},
     number = {5},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1982_18_5_a0/}
}