@article{DE_2000_36_8_a15,
     author = {A. N. Vetokhin},
     title = {The exact descriptive type of the set of proper linear systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1128--1129},
     publisher = {mathdoc},
     volume = {36},
     number = {8},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2000_36_8_a15/}
}