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@article{IVM_1977_9_a6, author = {N. M. Kostenko}, title = {A~transformation operator}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {43--47}, publisher = {mathdoc}, number = {9}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1977_9_a6/} }
N. M. Kostenko. A~transformation operator. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 9 (1977), pp. 43-47. http://geodesic.mathdoc.fr/item/IVM_1977_9_a6/