@article{UZKU_1969_129_3_a16,
     author = {V. P. Tret'yakov},
     title = {On the question of the formal multiplication of series},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {152--161},
     publisher = {mathdoc},
     volume = {129},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZKU_1969_129_3_a16/}
}