@article{DAN_1961_137_5_a7,
     author = {I. Ts. Gokhberg and M. G. Krein},
     title = {On the theory of triangular representations of nonselfadjoint operators},
     journal = {Doklady Akademii Nauk},
     pages = {1034--1037},
     publisher = {mathdoc},
     volume = {137},
     number = {5},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_137_5_a7/}
}