@article{DAN_1991_318_6_a5,
     author = {V. V. Kapustin},
     title = {A criterion for the reflexivity of contractions with a defect operator of the {Hilbert--Schmidt} class},
     journal = {Doklady Akademii Nauk},
     pages = {1308--1311},
     publisher = {mathdoc},
     volume = {318},
     number = {6},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_318_6_a5/}
}