@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/}
}