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@article{IVM_1961_5_a9, author = {V. P. Tret'yakov}, title = {On the theory of formal multiplication of double series}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {78--85}, publisher = {mathdoc}, number = {5}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1961_5_a9/} }
V. P. Tret'yakov. On the theory of formal multiplication of double series. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1961), pp. 78-85. http://geodesic.mathdoc.fr/item/IVM_1961_5_a9/