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@article{IVM_1967_2_a2, author = {I. I. Volkov}, title = {Summation of unbounded sequences}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {20--25}, publisher = {mathdoc}, number = {2}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1967_2_a2/} }
I. I. Volkov. Summation of unbounded sequences. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1967), pp. 20-25. http://geodesic.mathdoc.fr/item/IVM_1967_2_a2/