@article{MZM_2009_85_3_a2,
     author = {V. F. Gaposhkin},
     title = {On {Independent} and {Stationary} {Subsystems} of the {Walsh} {System} and {Periodic} {Multiplicative} {Systems}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {342--350},
     year = {2009},
     volume = {85},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2009_85_3_a2/}
}