@article{DE_1998_34_2_a9,
     author = {A. V. Lipnitskii},
     title = {On the measure of the irregularity sets of linear systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {211--215},
     publisher = {mathdoc},
     volume = {34},
     number = {2},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_2_a9/}
}