@article{MZM_1980_28_3_a2,
     author = {V. A. Skvortsov},
     title = {Example of a double {Haar} series},
     journal = {Matemati\v{c}eskie zametki},
     pages = {343--353},
     publisher = {mathdoc},
     volume = {28},
     number = {3},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1980_28_3_a2/}
}