@article{DE_1996_32_1_a1,
     author = {V. D. Budaev},
     title = {Some properties of root functions of differential operators that are connected with the unconditional basis property},
     journal = {Differencialʹnye uravneni\^a},
     pages = {9--14},
     publisher = {mathdoc},
     volume = {32},
     number = {1},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1996_32_1_a1/}
}