@article{DE_1990_26_6_a3,
     author = {N. B. Kerimov},
     title = {On the necessary conditions for the basis property},
     journal = {Differencialʹnye uravneni\^a},
     pages = {943--953},
     year = {1990},
     volume = {26},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_6_a3/}
}