@article{DAN_1957_115_2_a0,
     author = {D. \`E. Allakhverdiev},
     title = {On the completeness of a system of eigen-elements and adjoined elements of non-selfadjoined operators close to normal ones},
     journal = {Doklady Akademii Nauk},
     pages = {207--210},
     publisher = {mathdoc},
     volume = {115},
     number = {2},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_115_2_a0/}
}