@article{MZM_2004_75_3_a16,
     author = {P. A. Terekhin},
     title = {On {Perturbations} of the {Haar} {System}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {466--469},
     publisher = {mathdoc},
     volume = {75},
     number = {3},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2004_75_3_a16/}
}