@article{IVM_1976_4_a3,
     author = {L. N. Dudko and I. I. Kal'mushevskii},
     title = {Conditions for similarity to the operator $I^2$ in terms of the characteristic matrix-valued function},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {38--46},
     publisher = {mathdoc},
     number = {4},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1976_4_a3/}
}