@article{MMO_1960_9_a13,
     author = {P. L. Ul'yanov},
     title = {Convergence and summability},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {373--399},
     year = {1960},
     volume = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1960_9_a13/}
}