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@article{IVM_1985_3_a10, author = {I. I. Ryabcev}, title = {On the general theory of perfect operators}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {76--81}, publisher = {mathdoc}, number = {3}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1985_3_a10/} }
I. I. Ryabcev. On the general theory of perfect operators. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1985), pp. 76-81. http://geodesic.mathdoc.fr/item/IVM_1985_3_a10/