@article{DE_1981_17_2_a2,
     author = {S. A. Mazanik},
     title = {Asymptotically equivalent two-dimensional linear differential systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {220--226},
     publisher = {mathdoc},
     volume = {17},
     number = {2},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_2_a2/}
}