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@article{IVM_1999_7_a8, author = {A. M. Sidorov}, title = {On a~class of perturbed operators}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {61--66}, publisher = {mathdoc}, number = {7}, year = {1999}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1999_7_a8/} }
A. M. Sidorov. On a~class of perturbed operators. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 7 (1999), pp. 61-66. http://geodesic.mathdoc.fr/item/IVM_1999_7_a8/