@article{DAN_1996_349_5_a4,
     author = {N. B. Kerimov},
     title = {On the basis property of systems of eigen- and associated},
     journal = {Doklady Akademii Nauk},
     pages = {596--597},
     year = {1996},
     volume = {349},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1996_349_5_a4/}
}