@article{DE_1975_11_4_a20,
     author = {V. M. Millionshchikov},
     title = {A certain dense set in a space of linear systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {755--757},
     publisher = {mathdoc},
     volume = {11},
     number = {4},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_4_a20/}
}