@article{DE_1994_30_1_a14,
     author = {V. A. Il'in and E. I. Moiseev},
     title = {On the absence of the basis property of a system of root functions of a problem with an oblique derivative},
     journal = {Differencialʹnye uravneni\^a},
     pages = {128--143},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_1_a14/}
}