@article{DAN_1957_113_4_a8,
     author = {V. T. Poliatsky},
     title = {On the reduction of quasi-unitary operators to a triangular form},
     journal = {Doklady Akademii Nauk},
     pages = {756--759},
     publisher = {mathdoc},
     volume = {113},
     number = {4},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_113_4_a8/}
}