@article{MZM_1971_9_4_a11,
     author = {V. A. Skvortsov},
     title = {Theorems concerning the uniqueness of {Haar} series for summation methods},
     journal = {Matemati\v{c}eskie zametki},
     pages = {449--458},
     year = {1971},
     volume = {9},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_9_4_a11/}
}