@article{IVM_1969_7_a10,
     author = {V. M. Ryabtseva},
     title = {Values of the characteristic function of an isometric operator on the boundary, and the spectrum of its bounded orthogonal extension},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {74--78},
     publisher = {mathdoc},
     number = {7},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1969_7_a10/}
}