@article{DAN_1967_175_2_a3,
     author = {I. Ts. Gokhberg and M. G. Krein},
     title = {Triangular representations of linear operators and multiplicative representations of their characteristic functions},
     journal = {Doklady Akademii Nauk},
     pages = {272--275},
     year = {1967},
     volume = {175},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_175_2_a3/}
}