@article{DAN_1988_302_5_a8,
     author = {S. R. Treil'},
     title = {Angles between co-invariant subspaces, and the operator corona problem. {The} {Sz\"okefalvi-Nagy} problem},
     journal = {Doklady Akademii Nauk},
     pages = {1063--1068},
     publisher = {mathdoc},
     volume = {302},
     number = {5},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_302_5_a8/}
}