@article{MZM_2004_76_5_a9,
     author = {V. V. Kostin},
     title = {Generalization of the {Balashov} {Theorem} on {Subseries} of the {Fourier{\textendash}Haar} {Series}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {740--747},
     year = {2004},
     volume = {76},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2004_76_5_a9/}
}