@article{DE_1998_34_2_a3,
     author = {N. A. Izobov},
     title = {A description of the mutual arrangement of exponents of two-dimensional linear differential {systems.~I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {166--174},
     publisher = {mathdoc},
     volume = {34},
     number = {2},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_2_a3/}
}