Geodesic
Angles between co-invariant subspaces, and the operator corona problem. The Szökefalvi-Nagy problem
Doklady Akademii Nauk, Tome 302 (1988) no. 5, pp. 1063-1068 
S. R. Treil'. Angles between co-invariant subspaces, and the operator corona problem. The Szökefalvi-Nagy problem. Doklady Akademii Nauk, Tome 302 (1988) no. 5, pp. 1063-1068. http://geodesic.mathdoc.fr/item/DAN_1988_302_5_a8/
@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},
     year = {1988},
     volume = {302},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_302_5_a8/}
}
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