@article{DE_1975_11_5_a18,
     author = {I. F. Kushnirchuk and N. I. Nagnibida},
     title = {The completeness, in analytic spaces in the disc, of the systems of eigenfunctions of linear ordinary differential operators},
     journal = {Differencialʹnye uravneni\^a},
     pages = {924--927},
     publisher = {mathdoc},
     volume = {11},
     number = {5},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_5_a18/}
}