@article{DAN_1984_278_3_a0,
     author = {V. M. Bugadze},
     title = {Absolute convergence of the {Fourier{\textendash}Haar} series of superposition of functions},
     journal = {Doklady Akademii Nauk},
     pages = {521--523},
     year = {1984},
     volume = {278},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_278_3_a0/}
}