Geodesic
Completeness of the system of root vectors of operators in a space with indefinite metric
Funkcionalʹnyj analiz i ego priloženiâ, Tome 21 (1987) no. 1, pp. 66-67 
T. Ya. Azizov. Completeness of the system of root vectors of operators in a space with indefinite metric. Funkcionalʹnyj analiz i ego priloženiâ, Tome 21 (1987) no. 1, pp. 66-67. http://geodesic.mathdoc.fr/item/FAA_1987_21_1_a6/
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1987_21_1_a6/}
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[1] Gokhberg I.Ts., Krein M.G., Vvedenie v teoriyu lineinykh nesamosopryazhennykh operatorov v gilbertovom prostranstve, Nauka, M., 1965 | MR

[2] Azizov T.Ya., Iokhvidov I.S., Osnovy teorii lineinykh operatorov v prostranstvakh s indefinitnoi metrikoi, Nauka, M., 1968 | MR