@article{DAN_1984_278_5_a5,
     author = {G. M. Gubreev},
     title = {Spectral analysis of the differentiation operator and the},
     journal = {Doklady Akademii Nauk},
     pages = {1052--1056},
     publisher = {mathdoc},
     volume = {278},
     number = {5},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_278_5_a5/}
}