@article{DAN_1968_178_1_a6,
     author = {A. V. Kuzhel'},
     title = {Spectral analysis of unbounded non-selfadjoint operators in a space with indefinite metric},
     journal = {Doklady Akademii Nauk},
     pages = {31--33},
     publisher = {mathdoc},
     volume = {178},
     number = {1},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_178_1_a6/}
}