@article{DAN_1965_164_4_a2,
     author = {I. Ts. Gokhberg and M. G. Krein},
     title = {Multiplicative representation of the characteristic functions of operators close to unitary},
     journal = {Doklady Akademii Nauk},
     pages = {732--735},
     publisher = {mathdoc},
     volume = {164},
     number = {4},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_164_4_a2/}
}