@article{MZM_2003_73_3_a1,
     author = {E. D. Nursultanov and T. U. Aubakirov},
     title = {The {Hardy--Littlewood} {Theorem} for {Fourier--Haar} {Series}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {340--347},
     publisher = {mathdoc},
     volume = {73},
     number = {3},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2003_73_3_a1/}
}