@article{DAN_1980_252_1_a9,
     author = {Ya. V. Mikityuk},
     title = {Spectral theory of a class of nonselfadjoint operators},
     journal = {Doklady Akademii Nauk},
     pages = {40--43},
     publisher = {mathdoc},
     volume = {252},
     number = {1},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_252_1_a9/}
}