@article{DAN_1964_155_2_a7,
     author = {V. I. Matsaev},
     title = {Several theorems on completeness of root subspaces of completely continuous operators},
     journal = {Doklady Akademii Nauk},
     pages = {273--276},
     publisher = {mathdoc},
     volume = {155},
     number = {2},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_155_2_a7/}
}