@article{IVM_1987_6_a6,
     author = {V. A. Derkach and \`E. R. Tsekanovskiǐ},
     title = {On the characteristic function of {a~quasi-Hermitian} contraction},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {46--51},
     year = {1987},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1987_6_a6/}
}