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@article{IVM_1967_8_a5, author = {V. N. Polyakov}, title = {The theory of characteristic functions of linear operators}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {53--59}, publisher = {mathdoc}, number = {8}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1967_8_a5/} }
V. N. Polyakov. The theory of characteristic functions of linear operators. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (1967), pp. 53-59. http://geodesic.mathdoc.fr/item/IVM_1967_8_a5/