@article{FAA_1987_21_1_a6,
     author = {T. Ya. Azizov},
     title = {Completeness of the system of root vectors of operators in a space with indefinite metric},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {66--67},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1987_21_1_a6/}
}